How Can You Tell When Someone Is Using These Strategies Unethically?

How can people recognize when someone is using them unethically or being manipulative? Yes, sometime s you can't tell until the transaction is over and you realize that you've been fooled or duped. The last time i bought a television set, i wasn't really looking for a new t v, but i saw a great deal on a big screen t v that i knew had been rated very well by consumer reports. And 20 minutes later, i'm wheeling out of the store with that set in my cart.