I know the OP is from 2015, but this is actually still an issue imo: right now you can't see how much suspicion selling/buying something will raise (or how much suspicion doing 'cover trading' on the open/military market will allay) until
after you've done it. Which is realistic, maybe, but also isn't very clear and encourages figuring out the formula, looking up spoilers etc which generally doesn't seem to be the spirit of the game.
It'd be cool if we could get a little bar graphic showing the impact of the current trade, not sure where the ideal placement would be (I think either where i show it in the mockup or above/below the market window, like above the "all", "commodities" etc tabs or below the "open market", "military market", etc buttons) but I mocked up something in mspaint as a proof of concept: