The Resurrection of the Rentier#
In the 19th-century novels of Austen and Balzac, characters calculated their social standing not by their salaries, but by their “rents”. During this era, the total stock of capital in Britain and France was worth roughly seven years of national income. We believed that the wars and crashes of the 20th century had permanently destroyed this world of idle wealth. However, the data reveals that the weight of the past is returning with a vengeance.
Western societies are currently experiencing a resurgence of capital that mirrors the eve of World War I. We once believed that “human capital” and education would become the dominant forces of prosperity. Instead, we see the re-emergence of a society where the ownership of assets determines one’s life path more than the mastery of a craft. This shift is best understood through the capital-income ratio, a metric that quantifies the “weight” of wealth.
The Magnitude of Beta#
To measure how much past accumulation dominates current production, Piketty utilizes the capital-income ratio, abbreviated as the Greek letter \(\beta\).
The Foundation of the Second Law#
The capital-income ratio is defined by the formula:
$$ \beta = \dfrac{s}{g} $$
In this equation, \(s\) is the national savings rate and \(g\) is the economic growth rate. If a nation saves \(12%\) of its income (\(s = 12%\)) and grows at \(2%\) (\(g = 2%\)), the ratio \(\beta\) will eventually stabilize at \(6\). This means the total wealth of the country is worth six times its total annual income.
The Crucible of Stagnation#
The danger of this relationship lies in the denominator, \(g\). As economic growth slows down, the capital-income ratio \(\beta\) explodes. In the post-war “Golden Age,” high growth kept \(\beta\) low, around \(2\) or \(3\), allowing new work to compete with old wealth. Today, as growth “normalizes” to lower levels, the \(\beta\) in many Western countries has climbed back to \(5\) or \(6\). In France and Britain, this ratio has nearly doubled since the 1970s.
The Cascade of Capital Shares#
The rise of \(\beta\) directly increases the share of national income that flows to capital owners rather than workers. This “capital share” (\(\alpha\)) is calculated by the first fundamental law of capitalism:
$$ \alpha = r \times \beta $$
If the return on capital \(r\) is \(5%\) and \(\beta\) is \(6\), then capital owners capture \(30%\) of the entire national income (\(0.05 \times 6 = 0.30\)). Between the 1980s and 2000s, the share of economic performance allotted to capital income rose by nearly \(20%\) in France and Italy. This leaves a shrinking portion of the pie for the “labor share,” putting downward pressure on the wages of the remaining \(90%\) of the population.
The Structural Trap#
The rise of \(\beta\) creates a mathematical barrier to social mobility that no amount of “hard work” can easily overcome. When wealth is worth six years of national income, a person starting with nothing must save a massive portion of their earnings just to reach the middle class. The ladder of meritocracy is being buried under the sheer mass of existing capital.
So what? The return of high \(\beta\) values indicates that we are drifting back toward “patrimonial capitalism”. In this environment, the most critical economic decision an individual makes is no longer what they study, but who their parents are. To understand how we allowed this drift, we must look at the deliberate policy choices that dismantled the mid-century social state.
