Final answer:
The benefit of current industry testing practices mentioned by Warren Porter is that it leads to greater economic activity, with consumers receiving better or less expensive products, increased business profits, and higher employee incomes.
Step-by-step explanation:
Warren Porter's assessment of the current industry testing practices includes as a benefit the notion that it leads to greater economic activity. This aspect is reflective of the fact that when consumers get better or less expensive products, businesses with these superior or more affordable products can see an increase in their profits, and as a result, their employees may earn more income. Thus, on balance, the gains from these activities, including any economic benefits from innovations arising from research and development, outweigh the losses on a national level, leading to positive externalities such as enhanced economic performance and potentially greater environmental sustainability if these gains are reinvested into further improvements.