She could have added that changes in solar output have no impact on ocean acidification, the other major impact of rising carbon dioxide concentrations.

BBC: Solar predictions bring heat and light

In fact these problems are similar in kind and no more intractable than those which arise in measuring inter-temporal changes in real output and expenditure.

ECONOMIST: For Europe to decide

The recent downturn in the zone's output suggests that the region is vulnerable to sudden changes in fortunes just as it was 90 years ago, when competition from South-East Asian plantations wiped out its rubber-tapping industry.

ECONOMIST: Brazil��s industrial policy

Reynolds digs deep into the underlying data to show that what has been reported as rising inequality involves primarily changing demographics that reflect changing patterns of work and productive output, as well as misunderstood changes in the meaning and composition of the numbers being reported themselves.

FORBES: The Equality Of Reaganomics

"To keep prices stable, the Fed must see to it that the quantity of money changes in such a way to offset movements in velocity and output, " he wrote in this newspaper in 2003.

WSJ: What Would Milton Friedman Do Now?

Joseph Carson, an economist with Deutsche Morgan Grenfell in New York, has concocted such an index, which considers changes in property prices and share prices, producer input and output prices, along with consumer prices.

ECONOMIST: Should central banks try to target asset-price inflation?

Within most countries, government statisticians provide regular estimates of aggregate output and expenditure in real terms, after correction for price changes over time.

ECONOMIST: For Europe to decide