Jason Smith — Ramsey model and the unstable equilibrium of a pendulum

Magical economics.

Information Transfer Economics
Ramsey model and the unstable equilibrium of a pendulum
Jason Smith

Lars P. Syll — Solow on the irrelevance of the Ramsey model

Robert Solow: "There has always been a purist streak in economics that wants everything to follow neatly from greed, rationality, and equilibrium, with no ifs, ands, or buts. Most of us have felt that tug. Here is a theory that gives you just that, and thistime “everything” means everything: macro, not micro. The theory is neat, learnable, not terribly difficult, but just technical enough to feel like “science.”

Lars P. Syll’s Blog
Solow on the irrelevance of the Ramsey model
Lars P. Syll | Professor, Malmo University

Steve Randy Waldman — K is not capital, L is not labor

Many good observations and take-downs concerning neoliberal shibboleths about capital, investment, and labor.

Let’s talk first about “labor”. As Jones hints in his “bonus implication”, labor is not in fact measurable in terms of homogenous hours. What a brain surgeon can do with an hour is very different from what a child laborer can accomplish. Macroeconomically, our collective capacity to produce improves. You might, as Jones does, refer to this incorporeal je ne sais quoithat enhances labor over time as “human capital”, or as labor-augmenting technology. Like physical capital, it seems to accumulate. In empirical fact, “human capital” and its more sociable, incorporeal twin “institutional capital” seem to be much more important predictors of the growth path of an economy than physical capital. Europe and Japan bounce back quickly after war devastates their infrastructure. But imagine that a Rapture clears the Earth and pre-agrarian nomads take possession of perfect gleaming factories. I think you will agree that production does not recover so fast. Human and institutional capital dominate physical capital. [3]

Like physical capital, and unlike hours of the day, the collective stock of human capital grows over time, without obvious bound. Yet, at least under existing arrangements, we have no means of distinguishing between “returns to human capital” and “wages”. “Capital taxation”, in conventional use, refers to levies on capital gains, dividends, and interest. As a political matter, results like Chamley-Judd are often used to support setting these to zero. But eliminating conventional capital taxes shifts the cost of government to wages, which include returns to human capital. If human capital accumulation is as or more important than other forms of capital accumulation, and if the quality of effort that people devote to building human capital is wage-sensitive, then taxing wages in preference to financial capital may be quite perverse. Further, while physical capital grows by virtue of nonconsumption, it seems plausible that human capital development is proportionate to its use, which would render a tax penalty on “wages” particularly destructive. Fundamentally, Chamley-Judd logic suggests that we should tax least the factor most capable of expanding to engender economic growth. You don’t have to be a new-age nut to believe that human and institutional development, which yield return in the form of wages, may well be that factor. It is perfectly possible, under this logic, that the roles of capital and labor are reversed, that the optimal tax onlabor should be zero or even negative, because returns to physical and financial capital are so enhanced by human talent that even capitalists are better off paying a tax to cajole it.

Interfluidity
K is not capital, L is not labor
Steve Randy Waldman