All business and dealings can be summarised as follows:
i. The Seller offer a price.
ii. The Buyer agreed and accepted the price with consideration.
iii. The Seller accept the buyer acceptance of the price with consideration.
iii. The deal/contract is closed. Transaction done!
The term 'dishonest' will comes in between the 2 considerations point of the buyer & seller. Has he/she (buyer/seller):
i. Given enough time to consider,
ii. Under some sort of circumstance stress when he/she makes the decision
iii. Has been mislead/misrepresented by any party etc.
Personally I would consider any acts of the points as dishonest.
Here are some examples to emphasis my points:
Example 1
Most recent cases of those damn time sharing marketing schemes. Someone will call you claiming that you win an travel package/expensive prize. Misleading some to attend some sort of talk. After which they will put you in some sort of stress and do not let you leave the place without signing up for some packages. And at the end of the day, even if you do sign up the package, they will give you some crap prize, very much different from what the told you over the phone earlier.
Example 2
When you want to purchase some goods/services. The sales person claimed that, that particular item can perform some fantastic features. He would sound so confident and give you so much assurance which make you trust him. All these is done intentionally. However after you buy, and start reading the manuals, you found that whatever the salesperson told you earlier are crap. So you have been misled and misrepresented in buying that product.
Example 3
When you are choosing some things from a store. A sales person keeps following you and pestering you to choose quickly. The more funny thing is that, this sales person can seems to read your mind, every item you set eyes on, he/she would tell you that it is the best and will suit you, blah, blah, blah. Moreover, if you decide not to buy that particular brand and choose another brand of similar product, this sales person will quickly takes back all his words previously on the previous brand. He will even go into banish/tarnish the previous brand and move on to the new brand you have just selected. His motive is to close the sales quickly so that you will make a haste decision which normally you'd regret it later.
I've personally witness such acts performed by a camera shop in funan 3rd storey, Shop Name: Jxxxxxx. A tourist went to the shops looking for DSLR camera, the sales person introduce Nikon D70 to the tourist... the sales person sells D70 as if it is the top of the world. However mid way through when the tourist decided to buy the D70, the sales person then realise that they have runs out of stock. Then suddenly the sales person change his praises on D70 and now introduces Canon 300D. He even go into tanishing Nikon by saying that the after sales service is no good just to hope that he can now sell his 300D as he got no more stock of the D70.