Biodegradable materials are lesser expensive compares with plastics because it goes directly to the ideal state of plastics want to achieve, it's not only means saved a lot of processes, experiment cost, and cost of labor but also saved a lot of time. Biodegradable materials help save the cost of products on two major aspects:
(1)Save the cost of the product itself. Thinking about the cost of removing BPA out of plastics, heavy metals out of plastics, and bad chemicals out of plastics, biodegradable materials is really cheap. What is the cost if you make petrochemical plastics degrade like paper and wood in a short period of time? The cost is high and will need a long period of time to do R&D, but biodegradable materials could go directly like paper and wood at a very cheap price. Also, microplastics are always a headache that has never been solved on all kinds of plastics since its invention, a lot of sea mammals died from microplastics, a lot of fish died from microplastics, and many microplastics even come into the human body, how you can solve it, what will be the cost? Plastics factories should ask their R&D department to estimate the cost of it, it should be an astronomical figure. But biodegradable materials' cost only counts the negligible number of a ton's price.
(2)Save all kinds of hidden costs especially related to social. Plastics have a huge environmental impact, which will force governments to spend a huge cost to remove environmental pollution and will spend a lot of funds to solve public health problems which were occurred from plastic pollution. Where does this money come from? It comes from factories, and all kinds of other companies, taxpayers, individuals. If this money could be saved, it can be used to help in education, and people who will in need, which will return increase the consumption capacity of a country, thus manufacturers who making products could have better sales.