1. Reciprocity. We are obliged to give if we have been given something.
2. Scarcity. If it's scarce, we want it more. Use this by highlighting the Benefits, Uniqueness and Possible Loss.
3. Authority. We are more likely to comply with a request if it is coming from a perceived authority/expert.
4. Consistency. We want to be consistent with our past commitments, even if the initial commitment is much smaller.
5. Liking. We like people who are similar, who give us compliments and who co-operate with us.
6. Consensus. If others (especially similar others) are doing it, then we are more likely to do it ourselves.
