3 Engel coefficient: refers to the proportion of food expenditure amount to the total expenditure amount. Engel's law refers to the law of the decline in the ratio of food consumption expenditure to total household consumption expenditure with the improvement of family living standards. (% Of life is good). Based on the above definition, is the following statement correct? ["Wang Ming's total expenditure this month was 1,000 yuan, of which 500 yuan was used for food expenses; in the second month, the total expenditure was 1200 yuan, of which 600 yuan was used for food expenses, indicating that his family's living standard has increased.", 'Xiaohua buys snacks of 100 yuan per month and the basic meal costs 300 yuan, so his Engel coefficient is 33%.', 'Americans generally spend 20% of their total expenditure on food, while Chinese spend 50% on food, indicating that Americans have a higher quality of life than Chinese.', 'People who spend all their expenses on food purchases have a happy life.']