I don`t know about any industry except sewn products so I would have to say this varies. In apparel, if you`re a new or start up line, the commission is between 10%-15%. The most typical rate is @ 12%+. Once your line is proven (meaning it sells itself and stores consistently reorder), it might go down to 10%.
If you are a larger firm (10-20 million in sales) the commission may go down to 8%. Again, I can`t speak to other industries but in apparel, once you exceed 20 million or so, it`s more typical you hire an increasing number of sales reps as full time employees rather than relying strictly on independents. If these are employees rather than independent reps, obviously you pay salary, expenses and a much smaller rate of commission, usually 2%-3%. This also applies if you have a sales manager employee. If you use only independents but have an employee sales manager, they get salary plus a percentage of the take that the other reps bring in.
Lastly, obviously our sales orders are smaller than an airplane. If someone is "lucky" (or unfortunate) enough to score a large department store account that buys a whole lot of stuff, it is more typical that the store goes through the company directly usually via what`s sometimes called a buying office (long story). This becomes what we call a "house account" meaning the manufacturer services the account directly so no sales rep that gets a commission.
---~Nurture people, not products~