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The fair value of shares vested for our restricted Class A Common Stock awards is as follows: 

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The weighted average grant-date fair value of performance share units granted with a market condition and the weighted average inputs used to estimate the fair value on the date of grant using the Monte Carlo Simulation model are as follows: 

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Based primarily on historical volatility levels of our Class A Common Stock. (1) 

Based on the implied yield currently available on U.S. Treasury zero coupon issues with a remaining term equal to the performance period. (2) 

No expected dividend yield as units granted earn dividend equivalents. (3) 

## Employee Stock Purchase Plan 

We have an Employee Stock Purchase Plan under which 9,000,000 shares of Class A Common Stock may be issued. Under the terms of the plan, eligible employees may purchase shares of our Class A Common Stock through payroll deductions. The purchase price is the lower of 85% of the fair market value of the stock on the first or last day of the purchase period. For the years ended February 28, 2021, February 29, 2020, and February 28, 2019, employees purchased 67,801 shares, 69,324 shares, and 76,844 shares, respectively, under this plan. 

## Other 

As of February 28, 2021, there was $66.8 million of total unrecognized compensation cost related to nonvested stock-based compensation arrangements granted under our stock-based employee compensation plans. This cost is expected to be recognized in our results of operations over a weighted-average period of 2.1 years. With respect to the issuance of shares under any of our stock- based compensation plans, we have the option to issue authorized but unissued shares or treasury shares. 

