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What is a good size distribution for buying gold?
Look at a broader diversification. Something like: For physical gold, I'd look at a mix of gold coins and bullion. Study the pricing model for coins -- you'll probably find that the spreads on small coins make them too expensive. There are a few levels of risk with storing in a vault -- the practical risk is that your government will close banks in the event of a panic, and your money will be inaccessible. You need to balance that risk with the risk to your personal security that comes with having lots of gold or cash in your home. My recommendation is to avoid wasting time on the "Mad Max" scenarios. If the world economy collapses into utter ruin, we're all screwed. A few gold coins won't do much for you.