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There ain't no such thing as a free lunch
"There ain't no such thing as a free lunch" (alternatively, "There is no such thing as a free lunch" or other variants) is a popular adage communicating the idea that it is impossible to get something for nothing. The acronyms TANSTAAFL and TINSTAAFL, and initialism TNSTAAFL, are also used. Uses of the phrase dating back to the 1930s and 1940s have been found, but the phrase's first appearance is unknown.〔 The "free lunch" in the saying refers to the nineteenth-century practice in American bars of offering a "free lunch" in order to entice drinking customers.
The phrase and the acronym are central to Robert Heinlein's 1966 science-fiction novel ''The Moon Is a Harsh Mistress'', which helped popularize it. The free-market economist Milton Friedman also popularized the phrase〔Safire, William ''On Language; Words Left Out in the Cold" New York Times, 2-14-1993 ()〕 by using it as the title of a 1975 book,〔Friedman, Milton, ''There's No Such Thing as a Free Lunch'', Open Court Publishing Company, 1975. ISBN 087548297X.〕 and it is used in economics literature to describe opportunity cost. Campbell McConnell writes that the idea is "at the core of economics".
==History and usage==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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