Claire Boyte-White is the lead writer for NapkinFinance.com, co-author of I Am Net Worthy, and an Investopedia contributor. Claire's expertise lies in corporate finance & accounting, mutual funds, ...

James Chen, CMT is an expert trader, investment adviser, and global market strategist. Option margin is the collateral (cash or securities) an investor must deposit before writing or selling options ...

In technical terms, leverage is the ratio between the amount of money you have in your account and the total size of positions the broker allows you to take. You’re using leverage every time you enter ...

The profit margins for jewelry makers and sellers can vary widely, particularly given the numerous categories within this industry. Fine jewelers who either make their own products or source their ...