Market effect refers to the conditions achieved by an industry in terms of price, output, cost, profit, product quality and variety, and technological progress under the certain market structure. Which of the following does not belong to the test market effect? ['Is the profit of the industry reasonable?', 'Whether the blind expansion of industrial production is compatible with the growth of market demand.', 'which is the personal taste of consumers.', 'Is there any waste in selling expenses and product modification?']