Everything has a cost or consequence, even if it's not immediately apparent; nothing is truly free.
This phrase originated from the practice of 19th-century American saloons offering 'free' lunches to customers who bought drinks. The lunch wasn't actually free - its cost was built into the price of the drinks. Economist Milton Friedman popularized the phrase in the 20th century to explain economic principles.
This saying became a cornerstone of economic thinking, encapsulating the concept of opportunity cost - that every choice involves giving up something else. In the internet age, it's particularly relevant for 'free' services like social media, where users pay with their personal data and attention rather than money.
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