In economics, what term refers to having a lower opportunity cost than a competitor?

The functional distribution of income measures which of the following?

A) the distribution of income among households B) how federal tax revenues are related to the business function that employs taxpayers C) the proportion of income generated by the four types of expenditures on goods and services D) the distribution of earnings by the factors of production E) the distribution of income among nations

Joan's income has just risen from $940 per week to $1,060 per week. As a result, she decides to purchase 12 percent more lettuce per week. The income elasticity of Joan's demand for lettuce is

A) 0.75. B) 0.90. C) 1.00. D) 1.33.