________ expresses the error as a percent of the actual values

Which of the following statements is true about the economies of Africa?

A) South Africa's main export is oil. B) Nigeria is an upper-middle income country. C) Nigeria and South Africa, account for over two-thirds of sub-Saharan African GDP. D) South Africa is the largest country in Africa, and has a lower-middle income economy.

In ________, current prices reflect the price history and trading volume of the stock. It is of no use to chart historical stock prices to predict future stock prices such that you can identify mispriced stocks and routinely outperform the market

A) weak-form efficient markets B) strong-form efficient markets C) semi-strong-form efficient markets D) operational efficient markets