What does Bases Point mean?

Bases Point is the amount of change in the hundredth of a number that has moving during a period of time.

For example, let’s say a stock started at 1.00% for the day and at the end of the day when the stock market close. The stock ended at 1.50%.

Someone could say that the stock move up 50 bases point for the day reference that it’s the hundredth of the number that change.
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This term is usually used when talking about interest rate and financial lingo.