The following represents demand for widgets (a fictional product):
Q(D)=360-6P+0.003M-2P(R)
where P is the price of widgets, M is income, and P(R) is the price of a related (fictional) good, the wodget.
Supply of widgets is determined by
Q(S)=-20+4P
Widgets are a _________, and widgets and wodgets are _____________.
Select one:
a. inferior good; substitutes.
b. normal good; substitutes.
c. normal good; complements.
d. inferior good; complements.