In his textbook Early Retirement Extreme, the Danish astrophysicist Jacob Fisker points to another transformative technology: online secondhand markets. Most people don't appreciate that you can not only buy stuff dirt-cheap online, you can also store your stuff for free. Think of eBay and Craigslist as enormous virtual storage warehouses, filled with millions of items you can borrow for next to nothing. When you need something, buy it secondhand. When you’re done with it, flick it off again. Chances are you’ll recover most of the price you paid, and if you understand the basics of writing ad
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