In principle, a currency’s command over any category of real input or output can be considered in terms of a suitably defined price index. The present focus is on the aggregate level and, in particular, a currency’s command over real final output. Earlier posts explore the topic in greater depth (links below). This is a crib notes version.
First acquaintance with MMT can bring clarity on key aspects of the monetary system that may previously have seemed unclear, yet likely also calls other questions to mind. For instance, if taxes do not finance a currency issuer, why are they necessary? And if banks create deposits ex nihilo (“out of nothing”), how is it that (other than the central bank) they are financially constrained and subject to risk? Or, considering that issuance of the currency is essentially costless to the issuer, how can the currency nonetheless have value to its users? MMT has clear answers to each of these questions.
This is not just a matter of markets requiring a system of enforced property rights, which presupposes government, at least in rudimentary form. In monetary economies, functioning markets also require a viable currency, one that is generally accepted in exchange. Government ensures a currency’s acceptance when it imposes and effectively enforces taxes that are payable only in that particular currency. This is true not only of exogenous taxes but of taxes on consumption, income and wealth so long as these are assessed in the government’s chosen unit of account.
Capitalist economies are demand led in the sense that both output and growth tend to reflect the behavior of autonomous demand, especially in the long run. Prices, in contrast, tend to be supply determined, reflecting cost. Supply shocks can temporarily dominate demand effects on output (for instance, as the result of war, a pandemic, or an oil shock), just as variations in demand, especially if supply is constricted, can temporarily dominate cost effects on prices. But the normal situation for a capitalist economy is demand-determined output and supply-determined prices.
In general terms, Modern Monetary Theory (MMT) defines the value of the currency as “what must be done to obtain it”. As MMT authors have noted, this general definition can be interpreted in terms of labor time. A Marxist interpretation, consistent with MMT’s general definition, is to define currency value in terms of socially necessary labor time. Two interpretations seem particularly suitable. A first approach is to define currency value as the reciprocal of the average money wage. This measure indicates the amount of labor-power that must be supplied in exchange for a unit of the currency and, on average, the amount of socially necessary labor that is performed in exchange for the currency unit. A second approach is to define currency value as the reciprocal of the monetary expression of labor time (MELT). This measure indicates the amount of socially necessary labor represented in a currency unit and therefore the amount of abstract labor represented in a currency-unit’s worth of any commodity, including labor-power, which under capitalism is treated as a commodity. The two definitions are closely and simply connected. They are also closely connected to other macro measures such as the price level and average productivity.
The marxian labor-time values of individual commodities fall as productivity improves. This means that if a currency unit is to command a stable quantity of use-values (i.e. physical goods and services) over time, the value of the currency must likewise fall as productivity improves. For a given distribution between wage and profit income, and a given share of value added in total value, a currency unit’s command over use-values will remain stable when money wages rise in line with average productivity. This also promotes price stability.
Inflationary pressures can originate from the demand side or the supply side of the economy. Demand-side inflation, known as demand-pull inflation, becomes increasingly likely as the economy nears full capacity. Inflation driven from the supply side, referred to as cost-push inflation, is possible in the absence of any excess demand for goods and services.
In an earlier post it is suggested that when value is conceived as socially necessary labor time, it makes sense to define currency value in one of two ways, either as the reciprocal of the average money wage paid for an hour of simple labor or, alternatively, as the reciprocal of the ‘monetary expression of labor time’ (MELT). Under the first definition, currency value is the amount of simple labor-power commanded by a unit of the currency and, on average, the amount of simple labor that will be performed in exchange for a unit of the currency when advanced as wages. Under the second definition, currency value is the amount of simple labor represented in a unit of the currency; that is, the labor-time equivalent of a currency unit.
A government with the authority to tax can ensure acceptance of a particular currency. By nominating a currency in which income and wealth are to be assessed, and imposing taxes that can only be paid in the nominated currency, the government establishes a demand for the currency.
This is true whether the government issues its own currency or instead adopts a currency issued by some other entity.
But a government that adopts somebody else’s currency is reduced to the status of mere currency user and, as a consequence, faces financial constraints similar to those that bind private households and firms.
Modern Monetary Theory (MMT) makes clear that the spending of a currency-issuing government necessarily precedes tax payments and bond sales to non-government. This has important implications. It means that a currency-issuing government does not – and cannot – require revenue prior to spending. It means that it is government spending that makes possible the payment of taxes and non-government purchase of bonds, not the other way round. And it means that when a government requires itself to match deficits with bond sales to non-government, it does so voluntarily, and on terms that are entirely at its discretion. In short, the constraints on a currency-issuing government are not financial in nature. The constraints on the spending of a currency-issuing government are properly understood in terms of real resources and the capacity of the economy to meet demand for higher output at stable prices. A currency-issuing government always has the capacity to purchase whatever is for sale in the currency of issue (which, of course, is not the same thing as saying that government should always do this). Yet, the manner in which fiscal and monetary operations are usually conducted can create an appearance that things are somehow otherwise. So, why is it that government spending necessarily comes first? In view of its implications, this is an important matter to grasp.