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What is the best use of “spare” money?
There's a hellova lot to be said for investing in real estate (simple residential real estate), even though it's grandma's advice. The two critical elements are 1) it's the only realistic way for a civilian to get leverage. this is why it almost always blows away "tinkering in the stock markets" in the 10-year frame. 2) but perhaps more importantly - it's a really "enforced" saving plan. you just have to pay it off every month. There are other huge advantages like, it's the best possible equity for a civilian, so you can get loans in the future to start your dotcom, etc. Try to buy yourself a very modest little flat (perhaps to rent out?) or even something like a garage or storeroom.  Real estate can crash, but it's very unlikely; it only happens in end of the world situations where it won't matter anyway.  When real estate drops say 30% everyone yells about that being a "crash" - I've never, ever owned a stock that hasn't had 30% down times. Food for thought!