Maybe just stop making advertising a tax-deductible business expense. Advertising in the US is negative-sum - the population is mostly spent out, so it doesn't create demand, it just moves it around a bit. But it adds to the price of products. In many cases, more than the price of producing the product. Tax policy should not encourage that.
Not saying this is a bad idea, but how will reduction in ads create more demand? If anything, demand will go down because people working in ads will lose jobs or get paid less.
