define and explain Smiths Percepts
i. non-satiation : assuming no costs, subjects need to choose the highest available reward
ii. saliency : subjects need to have an incentive to reveal their true preferences - if the higher the outcome the higher the reward then saliency is satisfied
iii. dominance : rewards and experimental structure should dominate the agents attention and costs associated with the experiment
iv. privacy : subjects payoffs and preferences should be private, otherwise they may hide their true preferences
v. parallelism : the environment and rules should simulate real world (internal validity)