A) Producing the combination of goods most desired by society
when individuals use all available information about an economic variable to make a decision, expectations are -rational
What is economic variable?
An economic variable is any measurement that helps to consider how an economy may function . for instance population, poverty rate, inflation, and available resources.
What are the five economic variables?
There are 5 common economic variable that are considered :
output, gross domestic product ( GDP ), production, income, and expenditures.
What factors cause economic growth?
Basically , there are two main cause of economic growth: growth in the size of the workforce and growth in the production activity (output per hour worked) of that workforce.
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Answer:
Contribution margin ratio = 1 - variable cost ratio
= 25%
(a) 
= 1,400,000
= 25,000
(b) For profit of $42,000,
= 1,568,000
= 28,000
(c) variable cost = sales price × variable cost ratio
= $56 × 75%
= $42
New contribution margin = 
New contribution margin = 
= 0.4
= 40%
= $875,000
= 12,500
