What do barriers to entry have to do with the extent of competition, or lack thereof, in an industry?
without barriers to entry :

a. existing firms will experience price leadership.
b. new firms will enter industries where firms are earning accounting profits.
c. new firms will enter industries where firms are earning economic profits.
d. existing firms will agree to charge the same price and not compete.
e. new firms will enter industries exhibiting diseconomies of scale.

In three to four sentences, explain the effect of a price ceiling on the quantity of a good and who this intervention intends to assist

You have just received notification that you have won the $2.0 million first prize in the centennial lottery. however, the prize will be awarded on your 100th birthday (assuming you're around to collect), 66 years from now. what is the present value of your windfall if the appropriate discount rate is 8 percent?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends > a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?