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Our estimation strategy relies on information about the avail-
ability of television in U.S. cities beginning in 1946. We use data
from Gentzkow (2006) on the year in which the first television
station appeared in a given market.
13 These data were compiled
from annual editions of the Television Factbook. We define televi-
sion markets using the Designated Market Area (DMA) concept
designed by Nielsen Media Research (NMR). NMR assigns every
county in the U.S. to a television market, such that all counties in
a given market have a majority of their measured viewing hours
on stations broadcasting from that market.
14 We define the year
television was introduced to a given...
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TG700 TV SIGNAL GENERATOR PLATFORM
