First principles thinking is one of the most effective mental tools for solving problems, especially the hard ones. And no one embodies this philosophy of first principles thinking better than Elon Musk, founder of PayPal, SpaceX, Tesla Motors and SolarCity.
Musk, in one of his interviews, said –
It’s most important to reason from first principles rather than by analogy. The normal way we conduct our lives is we reason by analogy. We’re doing this because it’s like something else which was done or it’s like other people are doing. It’s mentally easy to reason by analogy rather than by first principles. First principles is the Physics-way of looking at the world. What that really means is that you boil things down to the most fundamental truths and then reason up from there. That takes a lot more mental energy.
For example, somebody could say that battery packs are really expensive and that’s just the way they’ll always be because that’s the way they’ve always been in the past. No! That’s pretty dumb. If you apply that reasoning (analogy) to anything new then you won’t be able to get to that new thing.
For batteries people say, historically it has cost $600 per kilowatt hour and it’s not going to be much better than that in the future. First principles thinking would say, what is the market price of the basic constituents of the battery? It’s got Carbon, Nickel, Aluminium, and some polymers for separation. So breakdown on the material basis and ask, “If we bought that in London metal exchange, what each of those things cost?” Oh! It’s like $80 per kilowatt hour. Clearly, you need clever ways to take those material and combine them into the shape of a battery cell and you can have batteries much much cheaper than anyone realized.
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