Problem
1. Use economics to explain why diamonds are more expensive than water when water is necessary for survival and diamonds are not
2. Use economics to explain why people leave tips in the following two cases:
(a) at a restaurant they visit often;
(b) at a restaurant they visit only once.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.