Wagner's law

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What Wikipedia says

Wagner's law, also known as the law of increasing state activity, is the observation that public expenditure increases as national income rises. It is named after the German economist Adolph Wagner (1835–1917), who first observed the effect in his own country and then for other countries.

Excerpt from the Wikipedia article “Wagner's law”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Д.Ильин: vectorization, CC0, via Wikimedia Commons.