Silent change in this concept means there is no way to identify P2 from P, and both are sold under the same product name, product code, product specifications,

Silent change in this concept means there is no way to identify P2 from P, and both are sold under the same product name, product code, product specifications, and same product reviews. The later is the key aspect as selling products with the intent to trick the consumer is a defining aspect of fraud when done intentionally for profit purpose. While shrinkflation often also intend to trick the consumer, the details are usually defined. The packet weight or volume number is changed, the weight cost is change (a list requirement for many products where I live), the number of items has changed. With silent changes however there is no such information available and the consumer just will have to hope that their P is not P2.