What does "g" abbreviate in the standard definition of a public goods game?

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The standard definition of a public goods game is $$\pi_i=E-g_i+x\sum_{i=1}^{n}g_i$$ where $\pi$ stands for profit and $E$ stands for endowment. "g" of course stands for the contribution to the public good, but does it really simply abbreviate "good"?

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$g_i$ stands for the (monetary) contribution of individual $i$ to the public good.