This paper thinks demand elasticityofprice is different between demand curve of timber and environmental demand curve of forests, and the latter is much than the first.
木材需求曲线与森林环境需求曲线的价格需求弹性是不同的，后者远比前者大。
2
Formally, if s(p)gives the quantity supplied for each price p, the elasticityof supply, denoted h (the Greek letter “eta”, chosen because epsilon was already taken) is