## [Mental Transaction Costs](https://hackernoon.com/mental-transaction-costs-4e0a0a6fc838)

[Micropayments and Mental Transaction Costs](https://nakamotoinstitute.org/static/docs/micropayments-and-mental-transaction-costs.pdf)  Nick Szabo
szabo@best.com
http://www.best.com/~szabo/

## Productivity

[PRODUCTIVITY SLOWDOWN PUZZLE STRUCTURAL, CYCLICAL OR ERRONEOUS?](https://www.blackrock.com/sg/en/literature/whitepaper/bii-productivity-puzzle-international.pdf) 2016 


## Trade and comparative advantage

David Ricardo - heard from Matt Ridley