Commercial automobile insurance saw an average 2 percent price increase in April, while commercial property and employment practices liability insurance saw 1 percent increases, according to MarketScout. Most average commercial property and casualty insurance prices were flat in April. The largest accounts reported year-to-year decreases of 2 percent, and the smallest accounts saw rates rise by 1 percent.Commercial automobile insurance saw an average 2 percent price increase in April, while commercial property and employment practices liability insurance saw 1 percent increases, according to MarketScout. Most average commercial property and casualty insurance prices were flat in April. The largest accounts reported year-to-year decreases of 2 percent, and the smallest accounts saw rates rise by 1 percent.