translate English to French: On the supply side, subsidies to producers of language-specific commodities (assuming competitive goods markets) will shift the supply schedule downwards and to the right, inducing an increase from C1 to C2 of the equilibrium level of language-specific commodities consumed.
This point is easier to understand if one remembers that, owing to the scarcity of resources, those resources that are devoted to language policy would have to be taken away from other programs.