Which of the following is not correct?

Income elasticity can help us tell if the good/services in a study are normal or inferior ones.

Small companies usually have higher loading cost compared to those larger counterparts, which may cause smaller companies have more difficulty to insured their workers.

Randomized control trial is the best study design for program evaluation but not for finding the casual relationship

Demand is different from want because its based on culture and education

Minimum wage is kind of price floor, which usually cause a surplus on the market