"In reality, a teacher who retired after 30 years of service with an annual salary of $40,000 might receive guaranteed annual pension benefits of about $20,330. Under a typical private 401(k) plan, a guaranteed annual benefit might be only around $4,450 (assuming the money is invested in U.S. Treasurys and the employee buys an annuity).

BLS data on paid leave for teachers count vacation days only during the school year, omitting summer and long holiday breaks. A valid pay comparison should include this extra time off, in which teachers can enjoy longer vacations or earn additional income.

Properly counted, a typical public school teacher with a salary of $51,000 would receive another $51,480 in present or future fringe benefits. A worker in private business with the same salary would receive around $22,185 in fringe benefits."

Read Andrew Biggs and Jason Richwine's editorial at The Wall Street Journal.