Get a pack of cheap distinctive opaque pens. Hide a twenty or fifty dollar bill in one. Or two. Shuffle them. Now all your pens are potentially valuable, so you’re less willing to let them out of your sight. Low theft potential, high liquidity. If you have a cash emergency, useful. If you come across similarly designed pens, you’ll tend to accumulate them, so you’ll always have pens, and won’t have spent a large amount of money on a pen.
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