Mutualism can take on many forms: Symbiosis: in which both organisms live together in closely proximity, and in which both generally derive benefit. The relationship is obligate, meaning at least one of the species must be involved in the relationship to survive.
Lowest Option Commission. Lightspeed Trading offers low commissions on options, allowing both occasional and frequent traders to take advantage of competitively-priced options. While the standard fee is an already low $0.60 per contract, active traders who trade more than 500 contracts per month will qualify for even lower rates. Those who trade in excess of 100,000 contracts per month will pay merely $0.20 per contract.
As we mentioned, brokers make money by charging a commission on each trade. The amount a broker charges varies greatly between discount and full-service brokers. Traditionally, discount brokers don't do anything but execute the trade. Many online brokers, therefore, are discount brokers. You fill out the details of the trade on the Web site, hit buy or sell and someone on the other end makes the transaction. Discount brokers can charge as little as $5 to $15 per trade. Full-service brokers do much more than just execute trades.