Subsequently, the population as a whole (and not just the harvestable surplus) begins to decline.
As the brain starts to become used to those pleasures and demand them, neurons, sensing a surplus, begin to make less dopamine.
America's legislative odyssey from chronic deficits towards budget surplus began with George Bush's tax increase in 1990, was boosted despite fierce Republican denials by Mr Clinton's tax rise in 1993 and assisted, albeit messily, by last year's balanced-budget agreement.
The ROHO historians' initial overarching question concerned a remarkable occurrence: four successive years of budget surpluses, beginning in 1998, during President Clinton's second term.
The Bush-era tax cuts -- passed as the Republican solution to the accumulating surpluses beginning in the last years of the Clinton presidency -- were set to expire at the end of 2012, and the president had a choice to make.
It praised Canadian authorities for having proposed "a sound and credible plan to return to budget surpluses beginning in fiscal year 2015" but cautioned that an aging population and rising health care costs will require more effort to keep the country's finances stable.
In 1966, as America's post-war trade surpluses began to dwindle, The Economist ran an article entitled "The dollar and world liquidity: a minority view".
But they all have something in common: investors may be changing their minds about emerging markets.For the past few years, China, Brazil and others, with their high growth rates and large current-account surpluses, began to seem like desirable alternatives to developed markets.
As global interest rates tighten and current account surpluses begin to vanish, servicing the new mountains of public-sector debt and outstanding private debt will become critical concerns before the end of this year.
But, when milk surpluses began to dry up in the 1980s and the price of milk escalated, the milk was removed, considerably weakening the nutrition composition of these foods.
