Sir: The simplest way to conserve electricity is to stop wasting it. It is a known fact that commercial markets even in those countries that do not face shortage of electricity close at eight in the evening. But in Pakistan, which has been facing an energy crisis for over a decade, markets remain open till as late as 11:00 pm or even beyond that. The excuse offered for not opening shops early is that customers do not come before 11:00 am. Customers will not have much choice but to do their shopping before 8:00 pm when they know that the market will close at 8:00 pm sharp. Raja M Ikram Ullah KhanRawalpindi