How Social Media Annexes Your Cognitive Landscape

In my 2016 book, Deep Work, I proposed a strictly binary approach to social media: you should perform an honest cost/benefit analysis on the social media platforms in your life, and quit all services that don’t provide substantially more benefits than costs with respect to things you truly value. The issue with this idea, as I discovered, is that many people could identify a small number of important benefits provided to them by particular social media platforms that couldn’t be easily r...

 “Judge the value of what you have by what you had to gi...

The principle of an opportunity cost does not at first glance seem hard to understand. If you spend half an hour noodling around on Twitter, when you would otherwise have been reading a book, the lost book-reading time is the opportunity cost of the tweeting. If you decide to buy a fancy belt for £100 instead of a cheaper one for £20, the opportunity cost is the £80 shirt you could otherwise have bought. Everything has a cost: whatever you were going to do instead, but couldn’t. [...] ...

 Cost Benefits of Lead Cleanup

It's difficult to put firm numbers to the costs and benefits of lead abatement. But for a rough idea, let's start with the two biggest costs. Nevin estimates that there are perhaps 16 million pre-1960 houses with lead-painted windows, and replacing them all would cost something like $10 billion per year over 20 years. Soil cleanup in the hardest-hit urban neighborhoods is tougher to get a handle on, with estimates ranging from $2 to $36 per square foot. A rough extrapolation from Mielke's est...