depression, the Depression of 1920–21, was referred to as a "depression" by president Calvin Coolidge. However, in the 19th and early 20th centuries, financial crises were traditionally referred to as "panics", e.g., the 'major' Panic of 1907, and the 'minor' Panic of 1910–1911, though the 1929 crisis was more commonly called "The Crash", and the term "panic" has since fallen out of use. At the time of the Great Depression (of the 1930s), the phrase "The Great Depression" had already been used to refer to the period 1873–96 (in the United Kingdom), or more narrowly 1873–79 (in the United States), which has since been renamed the Long Depression. Common use of the phrase "The Great Depression" for the 1930s crisis is most frequently attributed to British economist Lionel Robbins, whose 1934 book The Great Depression is credited with 'formalizing' the phrase, though US president Herbert Hoover is widely credited with having 'popularized' the term/phrase, informally referring to the downturn as a "depression", with such uses as "Economic depression cannot be cured by legislative action or executive pronouncement", (December 1930, Message to Congress) and "I need not recount to you that the world is passing through a great depression" (1931). Occurrence Due to the lack of an agreed definition and the strong negative associations, the characterization of any period as a "depression" is contentious. The term was frequently used for regional crises from the early 19th century until the 1930s, and for the more widespread crises of the 1870s and 1930s, but economic crises since 1945 have generally been referred to as "recessions", with the 1970s global crisis referred to as "stagflation", but not a depression. The only two eras commonly referred to at the current time as "depressions" are the 1870s and 1930s. To some degree, this is simply a stylistic change, similar to the decline in the use of "panic" to refer to financial crises, but it does also reflect that the economic cycle – both in the United States and in most OECD countries – though not in all – has been more moderate since 1945. There have been many periods of prolonged economic underperformance in particular countries/regions since 1945, detailed below, but terming these as "depressions" is controversial. The 2008–2009 economic cycle, which has comprised the most significant global crisis since the Great Depression, has at times been termed a depression, but this terminology is not widely