A new device called Square allows small businesses to accept credit cards using their smart phones for low fees. Scary simple to use.
Shipping costs for an online retailer can take all of your profits if not calculated correctly. Shipping quotes from UPS can be very inaccurate so that customer pays one price but the actual cost is much higher.
Lamps prior to electricity were of utmost importance. They kept the darkness away. Lamps are mentioned often in the Bible and are given tremendous significance. Without light, there is no direction, no path. There were no battery operated flashlights or any other lighting, just a palm sized clay lamp to keep the darkness away.