Economists are all too often preoccupied with petty mathematical problems of interest only to themselves. This obsession with mathematics is an easy … - Thomas Piketty

The main lesson for Europe and the world is clear: as a matter of urgency, globalization must be fundamentally re-oriented. The main challenges of our times are the rise in inequality and global warming. We must therefore implement international treaties enabling us to respond to these challenges and to promote a model for fair and sustainable development. Agreements of a new type can, if necessary, include measures aimed at facilitating these exchanges. But the question of liberalizing trade should no longer be the main focus. Trade must once again become a means in the service of higher ends. It never should have become anything other than that.

Modern economic growth and the diffusion of knowledge have made it possible to avoid the Marxist apocalypse but have not modified the deep structures of capital and inequality—or in any case not as much as one might have imagined in the optimistic decades following World War II.

I can now present the first fundamental law of capitalism, which links the capital stock to the flow of income from capital. The capital/income ratio β is related in a simple way to the share of income from capital in national income, denoted α. The formula is