というNBER論文が上がっている(ungated版)。原題は「Difference-in-Differences in the Marketplace」で、著者はRobert Minton(FRB)、Casey B. Mulligan(シカゴ大)。 以下はその要旨。 Price theory says that the most important effects of policy and technological change are often found beyond their first point of contact. This appears opposed to econ…