Later with the development of modern technology, people invented vegetable butter, instead of part of the animal butter, especially some mass-produced pastries, have begun to consume plant butter, greatly reducing the cost. Vegetable butter is made from vegetable oil cured by a special process, low cost, but it contains more trans fatty acids that people don't like much, and the amount of content has a relationship with the process.
Of course, there are also healthy senior vegetable butter on the market, so for this piece, can not be generalized, in general, the price of vegetable butter will be cheaper, animal butter is more expensive, after all, the raw material is more expensive.