Which of the following countries does not employ a value-added tax at the national level?

In the economic way of thinking, speculation can only occur

A) in a capitalist economy. B) in a society where time-travel is possible. C) under uncertainty. D) under perfect information. E) in an underground or illegal market system.

A local pizzeria raised its price from $9 to $11 for each pizza and the sales of its pizza decreased from 150 to 100 per day. What is the price elasticity of demand in this case?

A) 1/2 B) -2 C) -1/2 D) 2