"He who pays a tax should receive the benefit from the expenditure financed by the tax." This statement reflects which of the following principles for a tax?

An example of a supply shock could be ________

A) a technological innovation B) a natural disaster C) an oil price increase D) all of the above E) none of the above

Marge Sampson produces and sells 400 jars of homemade jelly each month for $3 each. Each month, she pays $200 for jars, $150 for ingredients, and uses her own time, with an opportunity cost of $500 . Her economic profits each month are:

a. $350. b. $500. c. $650. d. $700.