Elm wood is generally cheaper than ash wood. This is due to several factors that influence the supply and demand dynamics of these materials. Elm trees are more abundant and have a wider geographical distribution compared to ash trees, which are more scarce and limited to certain regions. Additionally, ash wood has been affected by the Emerald Ash Borer (EAB), an invasive pest that has decimated ash populations in North America, leading to increased prices for the remaining supply. According to the U.S. Forest Service, the cost of ash lumber has risen significantly due to the scarcity of the wood, while elm wood remains more affordable. Elm trees are also easier to grow and harvest, contributing to their lower cost.