Why does the supply curve slope upward? To answer this question, use the choices below to identify the characteristics of an upward-sloping supply curve. Instructions: In order to receive full credit, you must make a selection for each option. For correct answer(s), click the box once to place a check mark. For incorrect answer(s), click the option twice to empty the box. check all that apply Increasing opportunity costsunanswered Increasing marginal costsunanswered Diminishing marginal utilityunanswered A decrease in resource pricesunanswered An increase in resource pricesunanswered Increasing labor productivity