The recent COVID 19 chaos in Hong Kong has triggered Johnson Tam, an entrepreneur, to consider investing in a local surgical mask manufacturing plant.
Johnson’sproblem is to decide how large his plant should be. The annual returns will depend on both the size of his plant and a number of marketing factors related to the health situation of the Hong Kong society. After a careful analysis, Johnson developed the following payofftable:
Size of plant |
Good market ($) |
Fair market ($) |
Poor market ($) |
Small |
100,000 |
30,000 |
-10,000 |
Medium |
150,000 |
50,000 |
-30,000 |
Large |
200,000 |
50,000 |
-70,000 |
Very Large |
300,000 |
30,000 |
-200,000 |
For example, if Johnson constructs a small plant and the market is good, he will realise a profit of $100,000.
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a)
Decision table is following:
Size of plant |
Good market ($) |
Fair market ($) |
Poor market ($) |
Small |
100,000 |
30,000 |
-10,000 |
Medium |
150,000 |
50,000 |
-30,000 |
Large |
200,000 |
50,000 |
-70,000 |
Very Large |
300,000 |
30,000 |
-200,000 |
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b)
Using maximax criterion, maximum payoff of each decision is determined and then decision whose maximum payoff is maximum of all, is selected
Maximum payoff of Small plant = MAX(100000, 30000, -10000) = $ 100,000
Maximum payoff of Medium plant = MAX(150000, 50000, -30000) = $ 150,000
Maximum payoff of Large plant = MAX(200000, 50000, -70000) = $ 200,000
Maximum payoff of Very Large plant = MAX(300000, 30000, -200000) = $ 300,000
Maximum of the above Maximum payoffs is $ 300,000 associated with the decision to build Very Large plant
Therefore, maximax decision is to build Very Large plant
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c)
Using maximin criterion, minimum payoff of each decision is determined and then decision whose minimum payoff is maximum of all, is selected
Minimum payoff of Small plant = MIN(100000, 30000, -10000) = $ -10,000
Minimum payoff of Medium plant = MIN(150000, 50000, -30000) = $ -30,000
Minimum payoff of Large plant = MIN(200000, 50000, -70000) = $ -70,000
Minimum payoff of Very Large plant = MIN(300000, 30000, -200000) = $ -200,000
Maximum of the above Minimum payoffs is $ -10,000 associated with the decision to build Small plant
Therefore, maximin decision is to build Small plant
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d)
Using equally likely criterion, average payoff of each decision is determined and then decision whose average payoff is maximum of all, is selected
Average payoff of Small plant = (100000+30000-10000)/3 = $ 40,000
Average payoff of Medium plant = (150000+50000-30000)/3 = $ 56,667
Average payoff of Large plant = (200000+50000-70000)/3 = $ 60,000
Average payoff of Very Large plant = (300000+30000-200000)/3 = $ 43,333
Maximum of the above Average payoffs is $ 60,000 associated with the decision to build Large plant
Therefore, equally likely decision is to build Large plant
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The recent COVID 19 chaos in Hong Kong has triggered Johnson Tam, an entrepreneur, to consider...
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