Question: When did Catchings and Foster populareize their theory?
About the article "Great Depression", section "Inequality".

Candidate passages:
Two economists of the 1920s, Waddill Catchings and William Trufant Foster, popularized a theory that influenced many policy makers, including Herbert Hoover, Henry A. Wallace, Paul Douglas, and Marriner Eccles.
It held the economy produced more than it consumed, because the consumers did not have enough income.
Thus the unequal distribution of wealth throughout the 1920s caused the Great Depression.
According to this view, the root cause of the Great Depression was a global over-investment in heavy industry capacity compared to wages and earnings from independent businesses, such as farms.
The solution was the government must pump money into consumers' pockets.
That is, it must redistribute purchasing power, maintain the industrial base, but re-inflate prices and wages to force as much of the inflationary increase in purchasing power into consumer spending.
The economy was overbuilt, and new factories were not needed.
Foster and Catchings recommended federal and state governments start large construction projects, a program followed by Hoover and Roosevelt.
Catchings was accused of pressuring his players to abandon their studies in favor of football.
According to multiple players, Catchings "withheld textbooks and financial aid until players proved themselves on the field.
For some players, it was the middle of the semester before Catchings thought them worthy of getting their books.
As a result, 43 players on the 55-man roster had grade point averages below the NCAA minimum of 2.0.
The players demanded that Catchings be fired.
When the administration was slow to act, the players boycotted the program. 
He collaborated with his Harvard classmate Waddill Catchings in a series of economics books that were highly influential in the United States in the 1920s.
His influential books, written with Catchings, were "Money" (1923), "Profits" (1925), "Business Without a Buyer" (1927), "The Road to Plenty" (1928), and "Progress and Plenty" (1930).
With Catchings, he was one of the leading pre-Keynesian economists, in the underconsumptionist tradition, advocating similar issues to Keynes such as the paradox of thrift and economic interventionism.
The two are now rarely mentioned in contemporary economics texts, standing as they do in the shadow of Keynes's "The General Theory.
"Foster and Catchings rejected traditional laissez-faire economics and called for aggressive federal involvement to balance the economy lest destabilizing forces upset prosperity.
The main problem was underconsumption, which could be overcome by strategic government spending in public works.
The theory strongly influenced the anti-depression programs of Herbert Hoover, and Franklin D. Roosevelt, as well as Federal Reserve Board Chairman Marriner Eccles. 
Economists such as Waddill Catchings, William Trufant Foster, Rexford Tugwell, Adolph Berle (and later John Kenneth Galbraith), popularized a theory that had some influence on Franklin D. Roosevelt.
This theory held that the economy produced more goods than consumers could purchase, because the consumers did not have enough income.
According to this view, in the 1920s wages had increased at a lower rate than productivity.
Most of the benefit of the increased productivity went into profits, which went into the stock market bubble rather than into consumer purchases.
Thus the unequal distribution of wealth throughout the 1920s caused the Great Depression.
According to this view, the root cause of the Great Depression was a global overinvestment while the level of wages and earnings from independent businesses fell short of creating enough purchasing power.
It was argued that government should intervene by an increased taxation of the rich to help make income more equal.
With the increased revenue the government could create public works to increase employment and ‘kick start’ the economy.
In the USA the economic policies had been quite the opposite until 1932.
The Revenue Act of 1932 and public works programmes introduced in Hoover's last year as president and taken up by Roosevelt, created some redistribution of purchasing power.
The stock market crash made it evident that banking systems Americans were relying on were not dependable.
Americans looked towards insubstantial banking units for their own liquidity supply.
As the economy began to fail, these banks were no longer able to support those who depended on their assets – they did not hold as much power as the larger banks.
During the depression, “three waves of bank failures shook the economy.” The first wave came just when the economy was heading in the direction of recovery at the end of 1930 and the beginning of 1931.
The second wave of bank failures occurred “after the Federal Reserve System raised the rediscount rate to staunch an outflow of gold” around the end of 1931.
The last wave, which began in the middle of 1932, was the worst and most devastating, continuing “almost to the point of a total breakdown of the banking system in the winter of 1932–1933” The reserve banks led the United States into an even deeper depression between 1931 and 1933, due to their failure to appreciate and put to use the powers they withheld – capable of creating money – as well as the “inappropriate monetary policies pursued by them during these years”. 
A superb phrase maker and popularizer, he had a major impact on Franklin D. Roosevelt.
For example, FDR's talk of a nation "one-third ill-fed, ill-clothed, ill-housed" used one of Catchings' expressions.
With Foster, he was one of the leading pre-Keynesian economists, in the underconsumptionist tradition, advocating similar issues to Keynes such as the paradox of thrift and economic interventionism.
The two are now rarely mentioned in contemporary economics texts, standing as they do in the shadow of Keynes's "The General Theory."