In the above graphs a direct relationship is shown by

If the price of pizzas has risen from $4 to $5 at the same time that the price of an hour of spinning class has risen from $20 to $30, then

a. pizzas have become relatively more expensive. b. spinning classes have become relatively more expensive. c. the relative prices of pizzas and spinning classes have remained constant. d. workers' real income must have decreased.

Raising the minimum wage would:

A. help some workers while hurting others. B. help all workers and hurt all firms. C. hurt all workers and help some consumers. D. help workers and help consumers.