ESOPs were invented in the late 1950s, but did not become popular until the 1980s.
ESOPs were invented in the late 1950s but because of poor marketing, they only became popular in the 1980s.
mnli hypothesis: ESOPs were invented in the late 1950s but because of poor marketing, they only became popular in the 1980s. premise: ESOPs were invented in the late 1950s, but did not become popular until the 1980s.