In this paper, a conceptual model for estimating option price for groundwater quality protection is developed, and the effects of subjective demand and supply uncertainty and other variables on option price are examined. A contingent valuation study to measure option price for groundwater quality protection was conducted in southwestern Georgia. Valuation results suggest that the monetary benefits to citizens of protecting groundwater supplies from agricultural chemical contamination are quite large.

We study the leading term in the small-time asymptotics of at-the-money call option prices when the stock price process S follows a general martingale. This is equivalent to studying the first centered absolute moment of S. We show that if S has a continuous part, the leading term is of order √T in time T and depends only on the initial value of the volatility. Furthermore, the term is linear in T if and only if S is of finite variation. The leading terms for pure-jump processes with infinite variation are between these two cases; we obtain their exact form for stable-like small jumps. To derive these results, we use a natural approximation of S so that calculations are necessary only for the class of Lévy processes.