Except that if there are fewer people in employment, because they have been replaced by capital, you would expect aggregate demand to go down. There is no reason to assume that this fall in aggregate demand due to higher unemployment will be offset substantially, much less entirely, by a rise in aggregate demand due to higher wages at the other end. That the higher wages for the lucky people who have not been or cannot be replaced by robots/computers/etc will trickle down and create demand for more labour at the bottom end. There's no reason for me to believe this at all. It's just a narrative.
The comment that I agreed with Kaiserguard on was that you can trivially increase productivity by pricing low wage workers out of the market, and your plan is to do just that.
Productivity rises gradually. It doesn't happen all at once. If wages rise with productivity, then AD also rises. And that means that businesses expand to sell to that higher AD. That expanding of business makes jobs for those people who are displaced by capital. It is a dynamic process. There are always some people being displaced, but the overall numbers (or percentage of the workforce) that is displaced at any one time doesn't grow. So to say that just puts people out of work, and so that makes the productivity numbers look artificially good just doesn't match with the past 150 years or so of industrial history. Because if that was true, almost everyone would be unemployed by this time. After all, one person now produces as much as maybe 100 people 150 years ago.
The new sales opportunities of the greater consumer purchasing power is what makes industrialization possible. Without it the best you can hope for is the boom and bust cycle that the 19th century is noted for, as productivity outstrips demand, and then many of the producers go bankrupt. Rising wages offset that, and stabilize the system. What we are going through now is the consequences of wages being too low for too long. And in the long run everyone will be poorer because wages stayed low.
It's not "just narrative" it's the history of the developed world over the past 150-200 years. If there is not a match between purchasing power and productivity, then there has to be a massive crash. This is complicated because most markets now are global. But the Great Recession drags and drags because no one has the purchasing power to put people back to work. And that is true because wages are too low. And wages are too low, because there is in fact no connection between wages and productivity. The actual connection is between wages and the bargaining strength of labor. And that is very weak right now.
My plan does not price the lowest labor out of the market. At least not to any significant degree. Places with higher minimum wages do not have higher long term unemployment.
http://www.slate.com/blogs/moneybox...age_1960s_higher_wages_less_unemployment.html
http://www.juancole.com/2013/02/beggaring-employment-infographics.html
ABSTRACT
This paper examines the impact of minimum wages on unemployment duration. We
utilize the Displaced Worker Survey to estimate the effects of minimum wages on unemployment duration, while controlling for individual characteristics and state effects that may be correlated with the value of the minimum wage. The empirical results suggest that minimum wages have differential impacts on unemployment duration for unemployment insurance recipients and non-recipients, but there are no overall increases in unemployment duration associated with higher minimum wages. In fact, higher minimum wages are associated with shorter unemployment durations for insurance recipients; for non-recipients, there is less evidence of a statistically significant relationship. These results are robust to changes in specification and different measures designed to capture the binding nature of a state minimum
wage.
http://www.irle.berkeley.edu/events/spring07/pedace/pedace.pdf