Many politicians and NGOs argue that free trade is not enough; it should also be fair. On the face of it, fairness is self-evidently a good thing. However, fairness, in trade as in beauty, lies in the eye of the beholder. Frederic Bastiat, a 19th-century French satirist, once observed that the sun offered unfair competition to candle makers. If windows could be boarded up during the day, he argued, more jobs could be created making candles. American trade unions complain that Mexicans' lower wages, say, give them an unfair advantage. Mexicans say they cannot compete fairly against more productive American counterparts. Both sides are wrong. Mexicans are paid less than Americans largely because they are, in general, less productive. There is nothing unfair about that; indeed, it helps to make trade mutually beneficial. The mutual benefits of trade also disprove the fair traders' other complaint, that free trade harms poor countries. (See comparative advantage. )