It refers to a loosely organized group of Swedish economists that worked together, in Stockholm, Sweden primarily in the 1930s.
Like Keynes, they were inspired by the works of Knut Wicksell, a Swedish economist active in the early years of the twentieth century.
William Barber's comment upon Gunnar Myrdal's work on monetary theory goes like this: "If his contribution had been available to readers of English before 1936, it is interesting to speculate whether the 'revolution' in macroeconomic theory of the depression decade would be referred to as 'Myrdalian' as much as 'Keynesian'”[1]Two of the most prominent members of the Stockholm School were Stockholm School of Economics professors Gunnar Myrdal and Bertil Ohlin.
The article was published in response to the publication of Keynes' magnum opus, The General Theory of Employment, Interest and Money in 1936, and its purpose was to draw international attention to the Swedish discoveries in the field, many of which had predated the discoveries of Keynes.
Gunnar Myrdal was early in supporting the theses of John Maynard Keynes, maintaining that the basic idea of adjusting national budgets to slow or speed an economy was first developed in Sweden by him and the Stockholm School.