the administration is relying on depend on models that “substitute assumptions for identification,” Harvard economist Robert Barro writes today in the Wall Street Journal. “To figure out the economic effects of transfers one needs ‘experiments,’” Barro writes, “in which the government changes transfer in an unusual way—while other factors stay the same—but these events are rare.”
The truth is, both studies of the type Barro prefers, and studies using models, which he criticizes, have been conducted…
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