If an initial increase in investment spending of $30 caused equilibrium output to increase by $120, what is the value of the MPC?

The income elasticity of demand is ________ if the good is ________ good

A) positive; a normal B) positive; an inferior C) negative; a normal D) less than one; an inferior E) positive; a substitute

The total benefits to society from pollution abatement

A) increase at an increasing rate with the increase of pollution abatement. B) increase at a decreasing rate with the increase of pollution abatement. C) decrease at an increasing rate with the increase of pollution abatement. D) decrease at a decreasing rate with the increase of pollution abatement.