Under the Sale of Goods Act, 1930, a contract may be for goods the acquisition of which depends upon:

Section 6(2) provides that there may be a contract for the sale of goods "the acquisition of which by the seller depends upon a contingency which may or may not happen". Such a contract is valid even though the seller may never obtain the goods, whereas an agreement that depends on an impossible event, a wager or an unlawful act is void under ss.36, 30 and 23 of the Indian Contract Act, 1872.