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This paper proposes a public goods game (PGG) of two cooperative strategies with different quantities of input cost: the strategy with a higher quantity of input cost is labeled as quasi-cooperation, while that with lower input cost is labeled as quasi-defection. In an ideal classless society, the two strategies are independent, as in the classical PGG; however, in a more realistic class society, they are interdependent. On this basis, two models (An-PGG and In-PGG) are built to respectively describe the two class scenarios. The results for the An-PGG demonstrate that, to promote the quasi-cooperation, the quasi-defective cost should be reduced. The results for the In-PGG indicate that, the closer the two types of input are, the smaller is the difference between the proportions of the two strategies in the system, hence the more effective are the inputs and the greater is the economic benefit. The indispensability of the quasi …