Unlike return, however, risk is no more quantifiable at the end of an investment that it was at its beginning. Risk simply cannot be described by a single number. Intuitively we understand that risk varies from investment to investment: a government bond is not as risky as the stock of a high-technology company. But investments do not provide information about their risks the way food packages provide nutritional data.
Success and failure in our own national economy will hang upon the degree to which we are able to work with races and nations whose social order and whose behavior and attitudes are strange to us.