To “extirpate” means to complete eliminate, from the Latin word meaning to pull out by stem and root. To extirpate poverty means to eliminate its cause, so that it does not come back. Fundamentally, poverty comes from a low wage level, so we need to examine what makes a wage level low.
The wage level of an economy can be thought of as the wages paid to unskilled people. Those with greater skill and talent get higher wages, so some think that the solution to poverty is better education. But a stagnant economy also depresses the return to human capital, the extra wage for those who are more productive. In a thriving productive economy, even those with few skills are better off than skilled labor in a depressed economy. Indeed, in an unproductive economy, those with skills often find little market for their human capital.
The wage level of an economy is set by marginal labor, those who work at the least productive land in use. The classical “law of wages” says that when workers are mobile, the wage at the margin of production will set the wage level for the rest of the economy.
The margin of production has several edges. There is the horizontal extensive margin of land that is just barely worth using, land so unproductive it fetches no rent. There is the vertical extensive margin of the space above a city, into which taller buildings can rise, without increasing the site rent. There is also the intensive margin of adding more workers to land already being used. The wage at the intensive margin will equalize to that of the extensive margin. Workers are paid what they add to production, which is called their marginal product. Continue reading