the Endowment effect

When we own something, we tend to value it more highly. If we have to sell it, we want more than it is really worth.

Reciprocity

We feel obliged to give back to people who have given to us.

Consistency principle

We like to keep consistent what we think, say and do, and will change to ensure this is so.

The foot-in-the-door method

When asked to make a small commitment first, we are more likely to agree to a larger request later.

Framing effect

We react to a situation differently depending on whether we perceive the situation to be a loss or a gain.

Loss aversion

We feel the negative effects of loss more strongly than we feel the positive effects of an equal gain.