1. Look at the example of portable capital in a free market economy. The first alternative, harvesting the forest sustainably, provides a long-term supply of timber. The second alternative, cutting all of the trees and investing the money in another business, does not. Do you understand why the second alternative provides the highest long-term income? The second alternative explains why portable capital makes the unsustainable use of biological resources with slow growth rates a rational option from a business perspective. Think of concrete examples that illustrate unsustainable human–ecosystem interaction because of portable capital.