Writing about a trip to Switzerland in an article in the New York Times, economist Daniel Hamermesh noted that electrical outlets in Switzerland use an unusual three-prong plug. Adapters for that type of plug are not typically included in adapter sets, so he and his wife weren't able to plug their computers into their hotel's outlets. Hamermesh wondered: "Why does Switzerland renounce the network externalities that would come with using standard European plugs with their standard 220-volt electricity?" How is Switzerland "renouncing network externalities" by not using standard European plugs?