Commercial paper has a maximum maturity of

Over the past fifty years, there has been substantial closure of the gap in real GDP per person between which of the following groups of countries?

A) the United States and Central and South America B) Africa and Western Europe C) Central and South America and Africa D) the United States and Japan

The income elasticity of demand for an addictive substance is always positive

a. True b. False Indicate whether the statement is true or false