In 2011 the United States economy had a GDP of $14,991 billion according to the United Nations. If consumption was $10,729 billion, government spending was $2,594 billion, and net exports was -$568 billion, how much was investment spending?

Asupermarket has been experiencing long lines during peak periods of the day. the problem is noticeably worse on certain days of the week, and the peak periods are sometimes different according to the day of the week. there are usually enough workers on the job to open all cash registers. the problem is knowing when to call some of the workers stocking shelves up to the front to work the checkout counters. how might decision models the supermarket? what data would be needed to develop these models?