In the lecture, the professor gives an example of fruit juice to explain intrinsic and extrinsic factors. Intrinsic factor is when people buy a product by its perceived quality.Consumers buy fruit juice based on perceived quality, since they know the color and taste of the juice, they satisfied with the product. Because the reality and expectation match up. On the other hand, extrinsic factor is when people buy a product by its packaging or price, so it would not match the consumers' expectation.