m Qc 17. If an increase in the demand for cars reduces the cost of obtaining car parts for car manufacturers, then the long-run supply curve for cars is likely to be Demand T car A) horizontal because returns to scale are constant. B) horizontal because increases in output raise input prices. downward sloping because increases in output lower input prices. D) upward sloping because the input supply curve is upward sloping E) horizontal because the input supply curve is horizontal. P for car parts LR supply