What causes a downward movement along a supply curve of a commodity?
Downward movement along the supply curve implies contraction of the quantity supplied. Contraction of supply refers to the fall in supply due to fall in price of good, when all other factors of supply remain constant.
where,
Px = Price of commodity x
Py = Price of related goods (Substitutes or complementary goods)
Pi = Price of inputs, raw materials or cost of production
T = State of technology
G = Govt. Policy
GF = Goal of firm
NF = Natural factors