Some people tend to agree with their bosses no matter what, even if they may have a really good opion or idea. If you want to climb the ladder of success, speak up!
Even if you own your own business, offer an opinion if you think your customer may benefit from it, but be nice and never push. Customers are not always right and many will value an opinion if you're sincere and not out to just make a buck.
Remember, your success will always depend on how you react.