Compound Interest
Interest that earns interest on itself. Start with €100 earning 5% per year. After year one you have €105. In year two, that 5% applies to €105, not the original €100. Over time the difference between simple and compound growth becomes significant.
The kitchen-table version: imagine you put €1,000 in a jar that adds a coin every day based on how many coins are already in the jar. The more coins, the faster new ones appear.
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