Ploughman's lunch term "ploughman's lunch" is believed to date no further back than the 1950s, when the Cheese Bureau (a marketing body affiliated with the J. Walter Thompson advertising agency) began promoting the ploughman's lunch in pubs as a way to increase the sales of cheese, which had recently ceased to be rationed. Its popularity increased as the Milk Marketing Board promoted the meal nationally throughout the 1960s. Pierce the Ploughman's Crede (c.1394) mentions the traditional ploughman's meal of bread, cheese and beer. Bread and cheese formed the basis of the diet of English rural labourers for centuries, with skimmed-milk cheese, supplemented
No free lunch with vanishing risk If formula_6 is a semimartingale with values in formula_7 then "S" does not allow for a free lunch with vanishing risk if and only if there exists an equivalent martingale measure formula_8 such that "S" is a sigma-martingale under formula_8. No free lunch with vanishing risk No free lunch with vanishing risk (NFLVR) is a no-arbitrage argument. We have "free lunch with vanishing risk" if by utilizing a sequence of time self-financing portfolios which converge to an arbitrage strategy, we can approximate a self-financing portfolio (called the "free lunch with vanishing risk"). For a semimartingale "S", let formula_1 where a