Because the people with the power to decide to buy their own food. Data collected by questionnaire from a sample of the people who use the sea, Thailand 400.
Because it is the people who have the power to decide to buy themselves. Collecting data with a query from a sample of people who come to take advantage of Thai seafood market. The number of 400 people.
as it is a people who have the power in the decision to buy their own food with the information collected by the survey sample group of people in the market to use the services of Thai sea of 400