Joel Mokyr of Northwestern University talks with EconTalk host Russ Roberts about the future of the American economy. Mokyr rejects the claims that the we are entering an area of stagnation or permanently lower economic growth. He argues that measured growth understates the impact on human welfare. Many of the most important discoveries are new products that are often poorly measured and not reflected in measures such as gross domestic product or income. The conversation closes with a discussion of the downsides of technology and why Mokyr remains optimistic about the future.