For another example of a competitive market, consider phone service in the developing world, where many people relied on pay phones until the recent development of mobile phones generated a new competitive industry. In Pakistan, phone service is now provided by thousands of wireless women, entrepreneurs who invest $310 in wireless phone equipment (transceiver, battery, charger), a signboard, a calculator, and a stopwatch. Then they sell phone service to their neighbors, charging by the minute and second. On average, their net income is about $2 per day, about three times the average per capita income in Pakistan. The market for phone service has the features of a perfectly competitive market, with easy entry, a standardized good, and a large enough number of suppliers that each takes the market price as given. In contrast, to enter the phone business in the United States, your initial investment would be millions, or perhaps billions, of dollars, so the market for phone service is not perfectly competitive.