17)

True or false: a downward-sloping, convex indifference curve must represent two standard goods with diminishing marginal utility.

18)

If the same indifference curve can represent either 'goods' or 'bads' how can we tell which case is which?

19)

True or false: a downward-sloping, concave indifference curve must represent two 'addictive' goods with increasing marginal utility.