For me, I would say that saving doesn't make you rich, investing does. Some people don't know that, and they keep repeating the mistake. As y'all can see, dollar is now speeding up to 800/$, so, why would anyone waste his money by saving it instead of investing it?

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So, which financial mistake(s) do you think will keep people poor?

Getting debts(eg loans) to finance a liability (eg buying a car not for commercial purpose)

Xenry! It's good to invest but it will also be foolish to invest all of your income without having any savings to cover up for the timeframe your investment will yield result. So back to your question. Lack of savings and discipline will always make people find themselves back in square one if they keep on investing all their income always.