Table 1.

The attributes of pork hindquarters and their corresponding levels.

Attributes	Levels	Explanation
Traceability	Traceable code displaying information on hog farming, slaughtering, processing, transportation, and sale	The traceable code provides hog farming information (including the slaughter time, producer, animal quarantine), slaughter process information (including the quarantine, before slaughtering, and pork quarantine), and transportation and sale information (including the transportation time, transportation method, and marketing
	No traceable code	Pork or other relevant products do not have a traceability code
Lean meat essence test	Detected no lean meat essence	Pork or other relevant products have a label displaying the test result that the product does not contain lean meat essence
	No information about lean meat essence	Pork or other relevant products do not have a label indicating the lean meat essence test result
Animal welfare	Meets the national stocking density standard	A label on the stocking density indicating that it meets the national standard, i.e., pigs’ weight is less than 20, 20–50, 50–80, 80–110, their corresponding minimum lying space is not less than 0.2, 0.4, 0.6, or 0.8 m2 per pig
	No information about animal welfare	No relevant label on pork or other relevant products
Appearance	Bright red	Bright red for very fresh
	Light red	Light red for generally fresh
Price	12 yuan/catty	The price of pork is 12, 14, 16, or 18 yuan/catty
	14 yuan/catty
	16 yuan/catty
	18 yuan/catty