The slingshot means the presence of a high demand on the market of a particular good, fearing a slurry of offers over time.
The incursion can occur for a variety of causes: loss of production, immediate increase in needs, willingness to proceed to speculative purchases. In this case, very often, instead of incertitude, we talk about the accumulation of goods that disrupts the normal market and production conditions.
This phenomenon was known in the past as well, but it was of particular importance during World War II, when a lot of products, both for food use and various uses, began to fall on the market.
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