If common wheezes such as temporarily renting a house in a desirable area without actually moving in are made more difficult, parents may simply go the extra mile moving into their rented properties, for instance, and living there for the few additional months necessary to allay suspicion.

ECONOMIST: Ministers want to make the great schools game harder to play

For instance, Wesdorp's shop spent five years studying the properties that made ice cream creamy.

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The companies were shown, for instance, to have cynically disregarded evidence from their in-house researchers about the addictive properties of nicotine.

ECONOMIST: Tobacco

Equity Office Properties owns around 30% of offices in Chicago's west loop, for instance, and is said to be using its clout to influence prices.

ECONOMIST: American property