Trump claims that his plan to massively deregulate business will result in lower costs for the consumer. Is that true?
Unless a particular regulation is either completely redundant or arbitrary, weakening or eliminating it does not reduce costs–it just shifts them. Getting rid of labor regulations, for example, cuts costs for business owners, and possibly (not certainly) results in price reductions for consumers, but it imposes new health-related costs on workers. Eliminating air quality standards cuts business costs but damages public health and the quality of life. Permitting truckers to drive more hours improves the bottom line but puts the lives of other drivers at risk. And so on.
The process of creating and enforcing new regulations consequently has always focused on identifying and weighing all of their costs and benefits. Trump apparently believes that cutting business costs is a value that outweighs any other considerations.