breed [white_workers white_worker ] breed [red_workers red_worker ] breed [white_firms white_firm] breed [red_firms red_firm] globals [time] red_workers-own [my_firm ] white_workers-own [my_firm ] red_firms-own [employees adaptation] white_firms-own [employees adaptation] to setup ca setup-patches setup-workers setup-firms do_plot1 set time 0 end to setup-patches ask patches [set pcolor green - 3] end to setup-workers let a random-xcor let b random-ycor let c random-xcor let d random-ycor create-white_workers (initial_white_firms * capacity_max + 0.5 * initial_red_firms * capacity_max) ask white_workers [ set shape "person" set color white set size 1 setxy (a + random-float 6.0 - random-float 6.0) (b + random-float 6.0 - random-float 6.0) set my_firm -1 ] create-red_workers (initial_red_firms * capacity_max + 0.5 * initial_white_firms * capacity_max) ask red_workers [ set shape "person" set color red set size 1 setxy (c + random-float 6.0 - random-float 6.0) (d + random-float 6.0 - random-float 6.0) set my_firm -1] end to setup-firms let a random-xcor let b random-ycor let c random-xcor let d random-ycor create-white_firms initial_white_firms ask white_firms [ set shape "factory" set color white set size 2.5 set adaptation random-float 1.0 setxy (a + random-float 5.0 - random-float 5.0 ) (b + random-float 5.0 - random-float 5.0) ] create-red_firms initial_red_firms ask red_firms [ set shape "factory" set color red set adaptation random-float 1.0 set size 2.5 setxy (c + random-float 5.0 - random-float 5.0 ) (d + random-float 5.0 - random-float 5.0) ] end to go move-workers move-firms do_plot1 set time (time + 1) if (count red_firms with [employees < capacity_max] + count white_firms with [employees < capacity_max])= 0 [stop] end to move-workers let a random-float 1.0 ask-concurrent white_workers with [my_firm = -1] [ifelse (count white_firms with [employees < capacity_max] in-radius 4 != 0) [set my_firm [who] of one-of white_firms with [employees < capacity_max ] in-radius 4 set size 1.5 set color gray] [ifelse (count red_firms with [(employees < capacity_max and adaptation < probability_adaptation)] in-radius 4 != 0) [set my_firm [who] of one-of red_firms with [employees < capacity_max] in-radius 4 set size 1.5 set color blue] [ifelse information [ ifelse (count white_firms in-radius worldview_workers with [employees < capacity_max] > 0) [face min-one-of white_firms in-radius worldview_workers with [employees < capacity_max] [distance myself] set color white set size 1 if a < probability_move_workers [fd 1 ]] [ifelse (count red_firms in-radius worldview_workers with [(employees < capacity_max and adaptation < probability_adaptation)] > 0) [face min-one-of red_firms in-radius worldview_workers with [(employees < capacity_max and adaptation < probability_adaptation)] [distance myself] set color white set size 1 if a < probability_move_workers [fd 1 ] ] [if a < probability_move_workers [rt random 360 fd 1 set color white set size 1]]] ] [if a < probability_move_workers [rt random 360 fd 1 set color white set size 1]]]]] ask-concurrent red_workers with [my_firm = -1] [ifelse (count red_firms with [employees < capacity_max] in-radius 4 != 0) [set my_firm [who] of one-of red_firms with [employees < capacity_max] in-radius 4 set size 1.5 set color red + 2] [ifelse (count white_firms with [(employees < capacity_max and adaptation < probability_adaptation)] in-radius 4 != 0) [set my_firm [who] of one-of white_firms with [employees < capacity_max] in-radius 4 set size 1.5 set color orange ] [ifelse information [ ifelse (count red_firms in-radius worldview_workers with [employees < capacity_max] > 0) [face min-one-of red_firms in-radius worldview_workers with [employees < capacity_max] [distance myself] set color red set size 1 if a < probability_move_workers [fd 1 ]] [ifelse (count white_firms in-radius worldview_workers with [(employees < capacity_max and adaptation < probability_adaptation)] > 0) [face min-one-of white_firms in-radius worldview_workers with [(employees < capacity_max and adaptation < probability_adaptation)] [distance myself] set color red set size 1 if a < probability_move_workers [fd 1 ] ] [if a < probability_move_workers [rt random 360 fd 1 set color red set size 1]]] ] [if a < probability_move_workers [rt random 360 fd 1 set color red set size 1]]]]] ask white_workers with [my_firm != -1 ] [if distance turtle my_firm > 4 [set my_firm -1 set size 1 set color white ]] ask red_workers with [my_firm != -1] [if distance turtle my_firm > 4 [set my_firm -1 set size 1 set color red ]] end to move-firms let a random-float 1.0 ask white_firms [set employees (count white_workers with [my_firm = [who] of myself] + (count red_workers with [my_firm = [who] of myself])/ 2 ) ;count employees ifelse information [if (employees < (0.50 * capacity_max) and a < probability_move_firms ) [move-to max-one-of patches in-radius worldview_firms [count white_workers in-radius 2 with [my_firm = -1]]]] [if (employees < (0.50 * capacity_max) and a < probability_move_firms ) [ fd 2] ] ;movement decision if employees > capacity_max [ifelse ((count red_workers with [my_firm = [who] of myself] > ( employees - capacity_max)* 2 )) [ask n-of (( employees - capacity_max)* 2) red_workers with [my_firm = [who] of myself][ set my_firm -1 set color red set size 1]] [ask-concurrent red_workers with [my_firm = [who] of myself][ set my_firm -1 set color red set size 1 ]]] ; dismissing decision (not suitable first) set employees (count white_workers with [my_firm = [who] of myself] + (count red_workers with [my_firm = [who] of myself])/ 2 ) ; count employees if employees > capacity_max [ask-concurrent n-of (employees - capacity_max ) white_workers with [my_firm = [who] of myself] [set my_firm -1 set color white set size 1]] ; dismissing decision (suitable) set employees (count white_workers with [my_firm = [who] of myself] + (count red_workers with [my_firm = [who] of myself])/ 2 ) set color (white - (count red_workers with [my_firm = [who] of myself]* 0.1)) if adaptation > probability_adaptation [ask red_workers with [my_firm = [who] of myself] [set my_firm -1 set color red]] ifelse employees = capacity_max [set size 6][set size 2.5]] ask red_firms [set employees (count red_workers with [my_firm = [who] of myself] + (count white_workers with [my_firm = [who] of myself])/ 2 ) ifelse information [if (employees < (0.50 * capacity_max) and a < probability_move_firms ) [move-to max-one-of patches in-radius worldview_firms [count red_workers in-radius 2 with [my_firm = -1]]]] [if (employees < (0.50 * capacity_max) and a < probability_move_firms ) [ fd 2] ] if employees > capacity_max [ifelse (( count white_workers with [my_firm = [who] of myself]) > ( employees - capacity_max)* 2 ) [ ask n-of (( employees - capacity_max)* 2) white_workers with [my_firm = [who] of myself][ set my_firm -1 set color white set size 1]] [ask-concurrent white_workers with [my_firm = [who] of myself][ set my_firm -1 set color white set size 1]]] set employees (count red_workers with [my_firm = [who] of myself] + (count white_workers with [my_firm = [who] of myself])/ 2 ) if employees > capacity_max [ask-concurrent n-of (employees - capacity_max ) red_workers with [my_firm = [who] of myself] [set my_firm -1 set color red set size 1]] set employees (count red_workers with [my_firm = [who] of myself] + (count white_workers with [my_firm = [who] of myself])/ 2 ) set color (red - (count white_workers with [my_firm = [who] of myself]* 0.05)) if adaptation > probability_adaptation [ask white_workers with [my_firm = [who] of myself] [set my_firm -1 set color white]] ifelse employees = capacity_max [set size 6][set size 2.5]] end to do_plot1 set-current-plot "Number employed" set-current-plot-pen "total_employed" plot (count red_workers with [my_firm != -1] + count white_workers with [my_firm != -1]) set-current-plot-pen "employed_correctly" plot (count red_workers with [color = red + 2] + count white_workers with [color = gray]) set-current-plot-pen "employed_adapted" plot (count white_workers with [color = blue]+ count red_workers with [color = orange]) end @#$#@#$#@ GRAPHICS-WINDOW 487 10 889 433 17 17 11.2 1 10 1 1 1 0 1 1 1 -17 17 -17 17 0 0 1 ticks CC-WINDOW 5 529 898 624 Command Center 0 BUTTON 46 10 131 43 NIL setup\n NIL 1 T OBSERVER NIL NIL NIL NIL SLIDER 189 93 361 126 initial_white_firms initial_white_firms 0 15 5 1 1 NIL HORIZONTAL BUTTON 90 49 160 84 NIL go\n T 1 T OBSERVER NIL NIL NIL NIL SLIDER 13 93 185 126 initial_red_firms initial_red_firms 0 15 5 1 1 NIL HORIZONTAL SLIDER 14 170 188 203 probability_move_workers probability_move_workers 0 1 0.9 0.1 1 NIL HORIZONTAL SLIDER 189 132 361 165 capacity_max capacity_max 0 30 10 1 1 NIL HORIZONTAL SLIDER 13 130 187 163 probability_adaptation probability_adaptation 0 1 0.8 0.1 1 NIL HORIZONTAL SLIDER 193 170 368 203 probability_move_firms probability_move_firms 0 0.1 0.01 0.01 1 NIL HORIZONTAL SWITCH 217 36 337 69 Information Information 1 1 -1000 SLIDER 14 207 188 240 worldview_workers worldview_workers 1 25 1 1 1 NIL HORIZONTAL MONITOR 86 246 183 291 total workforce count red_workers + count white_workers 17 1 11 MONITOR 187 245 285 290 total_employed count red_workers with [my_firm != -1] + count white_workers with [my_firm != -1] 17 1 11 MONITOR 294 248 374 293 unemployed (count red_workers with [my_firm = -1] + count white_workers with [my_firm = -1])\n 17 1 11 SLIDER 192 208 368 241 worldview_firms worldview_firms 1 25 25 1 1 NIL HORIZONTAL PLOT 5 354 462 515 Number employed time NIL 0.0 10.0 0.0 10.0 true true PENS "total_employed" 1.0 0 -16777216 true "employed_correctly" 1.0 0 -10899396 true "employed_adapted" 1.0 0 -5825686 true BUTTON 16 50 88 84 go one step go NIL 1 T OBSERVER NIL NIL NIL NIL MONITOR 15 245 82 290 time time 17 1 11 MONITOR 94 292 172 337 red_employed count red_workers with [my_firm != -1] 17 1 11 MONITOR 176 293 264 338 white_employed count white_workers with [my_firm != -1] 17 1 11 MONITOR 267 294 356 339 red_unemployed count red_workers with [my_firm = -1] 17 1 11 MONITOR 363 294 464 339 white_unemployed count white_workers with[my_firm = -1]\n 17 1 11 MONITOR 12 291 90 336 adapted_firms count red_firms with [adaptation < probability_adaptation] + count white_firms with [adaptation < probability_adaptation] 17 1 11 @#$#@#$#@ WHAT IS IT? ----------- The model describes the movements of two categories of agents: - workers, moving to seek employment; - firms, looking for workforce to be recruited. Workers are divided into two groups (red_workers and white_workers) in relation to the different skills that they held. Firms, also, are divided into two groups (red_firms and white_firms) in relation to the different skills that they search. Workers and firms, with the same features, born divided in homogeneous groups, placed randomly in space. Red workers aim to be employed by a red firm while white workers aim to be employed by a white firm. HOW IT WORKS ------------ The first procedure is SETUP, activated from its button in the interface, that generates: - the green screen; - the white workers’ group. The number of people is determined by the formula: (initial_white_firms * capacity_max + 0.5 * initial_red_firms * capacity_max); - the red_workers’ group. The number of people is determined by the formula: (initial_red_firms * capacity_max + 0.5 * initial_white_firms * capacity_max); This generates a number of workers that is not less than the jobs offered by the firms. - the white firms group. The number is defined by the slyder initial_white_firms; - the red firms group. The number is defined by the slyder initial_red_firms; The four kinds of groups are placed randomly. Workers are created with shape as "person"; size 1 and they have color white if they are “white workers” and red if they are “red workers”. Firms are created with shape as "factory", size 2.5 and they are white or red according to the skills that they are looking for. Initially the workers’ variable “my_firm” is equal to -1 (it means that the worker is not employed). Every firm has got the variable adaptation that is randomly defined between 0 e 1 during the setup procedure. The second procedure is GO , which is activated from the button GO in the interface. The procedure GO is made up of other procedures including MOVE-WORKERS and MOVE-FIRMS. The second procedure is GO , which is activated from the button GO in the interface. The procedure GO is made up of other procedures including MOVE-WORKERS and MOVE-FIRMS. The instructions to MOVE-WORKERS are: First of all a local variable, “a”, is defined randomly between 0 and 1. Every unemployed white worker (with my_firm = -1) have to control in its area with radius equal to 4 if there are any white firms that are looking for workers. If the search is positive the worker copy his own ID number, represented by "who" which is a not negative number that identify each turtle, in my_firm, gets grey color and size 1.5. If no white firm has been found in his area, he controls if there are any red firms able to assume. If the search is positive the worker changes his own variable my_firm in the ID number (“who”) of the red firm found, gets blue color and size 1.5. The same happens to the red workers that gets red + 3 color and size 1.5 if they find a job in a red firm and orange color and size 1.5 if they find a white firm able to assume them. A white firm can assume a red worker only if its variable adaption if less than probability_adaptation defined by the user. If no firm is founded by the worker, he moves randomly in the space looking for a job. He can move only if the local variable “a” is less than the value of the slyder probability_move_workers Every employed worker has to control if his firm is already in his area with radius 4, if this doesn’t happen the worker lose his work, his variable my_firm changes in -1, the size in 1 and the color became white or red, as it was in the beginning with the setup procedure. The instructions to MOVE-FIRMS are: First of all a local variable, “a”, is defined randomly between 0 and 1. Concurrently every white firm counts workers with their own variable “my_firm” equal to his own ID number “who”. This number defines the firm variable “employees”, noting that workers employed in a firm with a different color take a weight of 0.5 in this score, while workers employed correctly weights 0,5. If "a" is less then probability_move_firms and if the variable employees is close enough to the maximum capacity of the firm, in other words, if employees is less than 0.5*capacity_max, the firm moves randomly in the space looking for workers to employ. The firm moving probability is smaller because of the high costs related to the business transfer. The user can reduce the capacity_max slyder value, therefore firms dismiss their workers. They begins to expel the “adapted” workers (red skill workers in white firms and white skill workers in red firms) and if this is not enought they reduce the correctly employed in order to have a number of employed less or equal to the capacity max of the firm. If firms assume adapted workers it will pay more training costs, therefore the more are the adapted worker the darker will be the firm’s color. When a firm reaches its maximus capacity its size becomes 6. The simulation ends when all firms reach their maximus capacity. A plot shows the progression of total employed people rapported to adapted employed and correctly employed. Some monitors show the passage of time, the total number of unemployed and employed workers for each class. HOW TO USE IT ------------- You create the world with the button setup and with button go the agents start to interact in the world. On the interface there are a lot of variables such as: initial_white_firms, initial_red_firms, capacity_max, probability_adaptation, probability_move_workers, probability_move_firms, worldview_workers, worldview_firms and information that can be moved by their slyders and switch; their changing modify the behaviors of agents looking for employment or workforce to employ. THINGS TO NOTICE ---------------- Try many different setup, you will see the importance of initial conditions in determining a equilibrium. In the information swich is active: - unemployed workers find their (nearest) same skill firm (in radium world_view_workers) that is looking for workeforce to employ, if they don’t find it they look for the other skill firm that could employ them. They will move to the firm direction. - firms that haven’t reach their own half maximum capacity search the patch, in the radium defined by worldview_firms, with the highest number of workers with the same skill of the firm near itself, move on it. Therefore the equilibrium will be reached faster. THINGS TO TRY ------------- Find the value of each variable that leads the model to equilibrium in less time, if it is possible to find one. Move each variable from the equilibrium to understand the different consequences on the model. Interact the variables moving together. EXTENDING THE MODEL ------------------- A training center could be created to teach unemployed workers the skills required by the market; so they could try to obtain a new employ in the other firms even if they originally didn't have the expertise required. A new variable "wealth" could be created to quantify income and costs of each firm. Costs of moving are really high. How many firms will survive? RELATED MODELS -------------- Economic Disparity from NetLogo Library. CREDITS AND REFERENCES ---------------------- http://www.bi.camcom.it/Page/t06/view_html?idp=1354 http://www.provincia.biella.it/on-line/Home/Sezioni/Lavoro-CentroPerlImpiego/articolo5140.html @#$#@#$#@ default true 0 Polygon -7500403 true true 150 5 40 250 150 205 260 250 airplane true 0 Polygon -7500403 true true 150 0 135 15 120 60 120 105 15 165 15 195 120 180 135 240 105 270 120 285 150 270 180 285 210 270 165 240 180 180 285 195 285 165 180 105 180 60 165 15 arrow true 0 Polygon -7500403 true true 150 0 0 150 105 150 105 293 195 293 195 150 300 150 box false 0 Polygon -7500403 true true 150 285 285 225 285 75 150 135 Polygon -7500403 true true 150 135 15 75 150 15 285 75 Polygon -7500403 true true 15 75 15 225 150 285 150 135 Line -16777216 false 150 285 150 135 Line -16777216 false 150 135 15 75 Line -16777216 false 150 135 285 75 bug true 0 Circle -7500403 true true 96 182 108 Circle -7500403 true true 110 127 80 Circle -7500403 true true 110 75 80 Line -7500403 true 150 100 80 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