Most peoples will trade with their neighbours, unless specifically ordered not to by their masters. Even then, trade will go on (albeit illegaly). When it comes to your [i]people[/i] you will have moderate control. Your dynasty and its actions are the only thing you have 100% control of.

[@The Omnipotent Sphere]

The outcomes will vary. Depending on Traits and Flaws you will be more or less likely to succeed with different actions, but you will not always recieve the same result.