Gas and Coal Utility companies can use a mix of plants different energy sources to produce electricity, mainly these are coal fired plants but increasingly they relying on gas turbines. Technological improvements in hydraulic fracturing, or "fracking," have decreased the cost of extracting smaller pockets of natural gas. What affect does fracking have on supply and demand for coal?
Fracking lowers the cost of natural gas. The supply of natural gas shifts out which lowers the price of natural gas. Since natural gas and coal are substitutes, this decreases the demand for coal.
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Marginal profit is positive at all positive output levels.
Answer the following statement true (T) or false (F)
Suppose Firm A and Firm B are considering whether to invest in a new production technology. For each firm, the payoff to investing (given in thousands of dollars per day) depends upon whether the other firm invests, as shown in the payoff matrix below. 
What is the Nash equilibrium of this game?
A. Firm A invests, and Firm B invests. B. Firm A doesn't invest, and Firm B doesn't invest. C. Firm A invests, and Firm B doesn't invest. D. Firm A doesn't invest, and Firm B invests.
?Strawberries (pounds) 
Consider the above table. Assuming the government imposes a price floor on strawberries of $8 per pound, what would be the likely result?
A. No change, equilibrium would prevail. B. a shortage of 2,000 pounds of strawberries C. The quantity demanded of strawberries would fall to zero. D. a surplus of 2,000 pounds of strawberries
When the total utility from consuming one good is maximized, marginal utility is
A. zero. B. minimized. C. positive. D. maximized.