David and Goliath: Underdogs, Misfits, and the Art of Battling Giants

outweigh the benefit.^3
Clear and a colleague—Dina Rose—
tested his hypothesis in Tallahassee,
Florida.^4 They went across the city and
compared the number of people sent to
prison in a given neighborhood in one
year with the crime rate in that same
neighborhood the following year—and
tried to estimate, mathematically, if there
was a point where the inverted-U curve
starts to turn. They found it. “If more
than two percent of the neighborhood
goes to prison,” Clear concluded, “the
effect on crime starts to reverse.”
This is what Jaffe was talking about
in Brownsville. The damage she was
trying to repair with her hugs and turkeys