On the conceptual and methodological stakes of Trade Wars Are Class Wars by Matthew C. Klein and Michael Pettis
Good writing on international macroeconomics reads like a detective novel. There’s a suspicious event—hundreds of millions of dollars in phantom FX swaps, a container port’s worth of missing exports—and an enormous cast of closely-linked characters. But instead of a preternatural ability to see the clear-cut means, motive, and opportunity of fictional characters in a pulp whodunit, the macroeconomic detective is armed with the knowledge that balance sheets always balance. This simple insight, that every transaction has two sides, means that there are certain aggregate relationships between transactions that must obtain for the world economy. Knowing this, it’s possible to chase actors across seemingly unrelated balance sheets to find where the system as a whole was forced to balance. From here, the skillful economist can identify the long-run tendencies that a given balance is likely to create. (Wynne Godley famously predicted the Global Financial Crisis in just this way, following US mortgage debt around the world and back.) This kind of detective work is difficult, and often unpopular. The balance sheet approach cuts through political and media platitudes to reveal who the winners and losers are in a given regime. By taking this approach to examining trade policy, Michael Pettis and Matthew Klein have, with Trade Wars Are Class Wars, written the ideal book for understanding the long-run trends that have shaped our dysfunctional present.
Pettis and Klein tell a broad story about the last fifty years of global economic development, which links the dynamics of global supply chains and tax evasion, and the historical shift from wage-led to profit-led growth.