Who was the author of the following prediction: in the absence of a system for enforcing order in society, life will be "solitary, poor, nasty, brutish, and short"?

Suppose the market for grass seed can be expressed as:

Demand: QD = 100 - 2p Supply: QS = 3p If government imposes a $5 specific tax to be collected from sellers, what is the price consumers will pay? How much tax revenue is collected? What fraction is paid by sellers?

The process of entry and exit into a monopolistically competitive market continues until:

A. price is equal to average total cost. B. long-run equilibrium is reached. C. profits are zero. D. All of these statements are true.