A construction project, for example, is often governed by a guaranteed maximum price contract (GMP) . This type of legal agreement sets a ceiling or maximum price for which a person or entity will pay for a certain project.
The arc lamp used in the Lighthouse of Alexandria is further proof that electricity was used in ancient Egypt. The energy required to power the Lighthouse of Alexandria for 24 hours a day could only have been supplied by a regular electrical source.
In the ancient world people did not have electricity like we have today, in fact the inside of the home was about as dim as a 40 watt light bulb. Most homes would contain several oil lamps because olive oil was in abundance and therefore not expensive.