Por qué los tipos de interés están tan bajos. Ya hemos explicado que la razón es la debilidad de crédito par financiar inversión, la inversión está cayendo, como se ve en EEUU en el el segundo trimestre
Carmen Reinhard añade otra explicación no sé hasta qué punto compatible o no con la de la debilidad de la inversión: los tipos de interés están bajos porque las deudas están altas. Al menos esto ha sucedido en la post guerra, cuando había que devolver deudas enormes y la única manera era renegociar y contener los tipos de interés (financial repression), facilitando la devolución.
"The behavior of real (inflation-adjusted) interest rates helps clarify the role of the post-crisis monetary-policy shift. As shown in the figure below, which plots the share of advanced economies with negative long-term interest rates (ten-year treasuries yielding less than the rate of inflation) from 1900 to 2016. In the run-up to the crisis, there are no recorded negative real returns on government bonds; since the crisis, the incidence of negative returns increases and has remained high. Of course, the share of countries with negative short-term treasuries (not shown here) is even higher since 2009.
"But the figure also shows that the 2010-2016 period is not the first episode of widespread negative real returns on bonds. The periods around World War I and World War II are routinely overlooked in discussions that focus on deregulation of capital markets since the 1980s. As in the past, during and after financial crises and wars, central banks increasingly resort to a form of “taxation” that helps liquidate the huge public- and private-debt overhang and eases the burden of servicing that debt.
"Such policies, known as financial repression, usually involve a strong connection between the government, the central bank, and the financial sector. Today, this means consistent negative real interest rates – equivalent to an opaque tax on bondholders and on savers more generally.
"So if a prolonged period of low and often negative real interest rates is not unprecedented, where is the novelty? More often than not, negative real rates were accompanied by higher inflation (as during the wars and the 1970s) than what we observe today in the advanced economies. Even when average inflation was modest (as in the 1950s and 1960s), it was still more volatile.
"In the 1930s, in the midst of economic depression and sharp deflation, US Treasury bills sometimes traded at negative yields (and real returns were still positive). In today’s low-inflation or outright deflationary environment, central banks may need negative policy rates (this is the novelty part) to produce negative real rates. In the eurozone and Japan, taxing banks that hold reserves (negative-interest-rate policy) will also encourage more bank lending, and thus stimulate growth.
En una época en que no se admiten quitas ni renegociaciones de deuda, como en el caso de Grecia, y sin la ayuda de un impulso inflacionistas, puede alargarse mucho el periodo de tipos negativos, sin que eso quería decir que es una situación óptima, como algunos pretenden.
"In an era when public debt write-offs (haircuts) are widely viewed as unacceptable (witness the European Union’s position on Greece) and governments are often reluctant to write off private debts (witness Italy’s reluctance to impose a haircut on holders of banks’ subordinated debt), sustained negative ex post returns are the slow-burn path to reducing debt. Absent a surprise inflation spurt, this will be a long process."
