Joe’s monthly income increases from $1,000 to $2,000. As a result, he decreases the number of his fast food meals from 20 to 5 per month. To Joe, are fast-food meals a normal or an inferior good?...

Joe’s monthly income increases from $1,000 to $2,000. As a result, he decreases the number of his fast food meals from 20 to 5 per month. To Joe, are fast-food meals a normal or an inferior good? What kind of elasticity can tell the answer? Explain.