The United States and other developed countries currently and historically have transferred considerable resources overseas to further their foreign policy objectives and to purchase oil and natural gas. These transfers are comparable in magnitude to estimates of the scale of the economic effort...

There are often "gains from sharing" underutilized goods with others. People routinely share tools, media, gear, electronics, toys, space, and vehicles with relatives, friends, and neighbors, and the internet is opening up new opportunities to share them with strangers. Drawing on the work of...