Two hallmarks characterise capitalist economies. Firstly, property is predominately in private hands. Consequently, goods and services are allocated via market mechanisms in which prices provide signals for businesses, workers, and consumers. Secondly, capitalist economies are highly capitalised. Indeed, the stocks of physical and human capital are relatively large in relation to the capitalist economies’ income flows.

On those two counts, Venezuela is retrogressing. With Chavismo, which commenced when Hugo Chavez took power in 1999, Venezuela has beaten a hasty retreat from anything that would qualify as “capitalist”. Today, it is clearly in the throes of a socialist-interventionist system.

With the transition to a socialist system, capital consumption becomes pronounced. Socialism consumes capital (read: eats seed corn). It fails to accumulate productive capital. And, this is why socialist systems retrogress into states of poverty. After all, capital consumption means that too much is consumed in the present at the expense of the future.

In his 1945 book The Economics of Peace, my professor, the great Ken Boulding, first presented his simple, but powerful, “Bathtub Theorem”. It is actually nothing more than a simple truism. The rate of accumulation is equal to the rate of production, less the rate of consumption. As Boulding put it, “Production may be likened to the flow of water from a faucet, consumption to the flow down to the drain. The difference between these two flows is the rate at which the water in the bathtub — the total stockpile of all goods — is accumulating.”

War, of course, drains the economic bathtub, as capital is destroyed (read: consumed). A transition to socialism also results in capital consumption — a lower level of water in the capital stock bathtub.

In Venezuela, the most important part of the economy is the state-owned enterprise PDVSA, the oil giant. Since Chavismo was ushered in, capital consumption has been the order of the day. Physical capital has been consumed at a rapid rate. In short, capital expenditures have been much lower than depreciation, plus amortisation (properly measured). PDVSA hasn’t even been investing enough to maintain its capital stock, let alone add to it. Accordingly, the level of water in PDVSA’s bathtub has been falling. If that wasn’t enough, the quality of PDVSA’s remaining capital stock has also been reduced due to poor maintenance practices.

On top of the reduced PDVSA capital stock and its deteriorating quality, PDVSA has witnessed a dramatic drop in the stock and quality of its human capital. After the 2002 coup attempt on President Chavez, he purged thousands of “non-loyalists” from PDVSA and replaced them with political hacks. The purges have continued under President Maduro. In consequence, the stock of quality PDVSA management and workers has been depleted.

Not surprisingly, PDVSA’s production has fallen (see the chart below). Capital consumption has reduced its ability to produce. At present, production is at levels not seen since 1947. Even though it has the world’s largest reserves, Venezuela is producing less oil than the US state of North Dakota, and the rate at which PDVSA is depleting its vast reserves is so slow as to render them worthless. In contrast to the major oil companies that extract a “median barrel” of oil from their reserves in 8-10 years, PDVSA takes 200 years to extract a median barrel.

The collapse in PDVSA’s production is a stunning indictment of the world’s worst oil company and of Venezuela’s socialist system. The bathtub is nearly empty.

Steve Hanke is professor of applied economics at The Johns Hopkins University and senior fellow at the Cato Institute. Over four decades Hanke has advised dozens of world leaders. Follow him on Twitter @Steve_Hanke .

This article originally appeared at forbes.com.