Many of the people who are considered poor in developed countries have a higher living standard than the average middle class citizens of some centuries ago. If we bracket the minority of the extremely poor in developed countries (the homeless for example), poverty today seems to be a relatively comfortable position to be in, once you see it in a historical perspective.
The same is true for people in poor countries. In 1820, average income per person was low everywhere in the world: about $500 in China and South Asia, and about $1000-$1500 in Europe (1993 US$ PPP). In developing countries today the range is between $1000 and $3100 (the world average is about $6000, the US has more than $40,000). So, the poor of today are equally well off or even better off than the average world citizen 200 years ago. 75% of the world’s population lived on less than $1 a day in 1820. Today, almost no one does in the West. In China it’s less then 20%, in South Asia 40%, in Africa half. Globally, it’s less than a quarter. Historically, almost everyone was poor; today it’s a minority.
So it seems almost futile to talk about poverty today. What is defined as poverty now was the normal way of life not so long ago. However, if that’s the way you want to go, the concept of poverty evaporates. You’ll always find someone who’s worse off. You just need to go sufficiently far back in time (or move in space) to find people who are more deprived and who make the current poor (or the local poor) seem relatively well off. The baseline is then the caveman and everyone else isn’t really “poor”.
Hence, if you want to keep talking about poverty, you can’t engage in historical comparisons. Does that mean that poverty can only be measured against the current average standard of living? That poverty is a percentage of current median income? In that case, there will always be poverty and the fight against it is a Sisyphean task. I’m not entirely convinced of the usefulness of the concept of relative poverty – that you should compare people’s living standards to society’s average standard (where poverty becomes basically income inequality) – and the historical rather than spatial version of relative poverty reinforces my doubts. However, I know that people commonly see poverty as a relative thing and that they may feel deprived because they compare themselves to their living compatriots and not only because they are below a certain absolute level of income, consumption or capabilities. Conversely, the middle classes of some centuries ago, even if they had the same standard of living as some of today’s poor, felt good about themselves because they looked at the poor of their time and felt that they had done comparatively well.
Still, relative poverty is not the only solution to the problem of historical comparisons. Poverty can be measured relative to average historical or current standards of living, but can also be measured by comparing consumption, income or capabilities to a commonly accepted absolute minimum level (for example a minimum amount of calorie intake).
In the latter case, it’s not important how rich the rich really are, or what the median income is, or how poor the poor were centuries ago. It’s important to know what are people’s basic needs, how much they cost, and how many people currently can’t buy the stuff to fulfill their basic needs. Of course, these basic needs can’t always be determined scientifically (as in the case of calorie intake) and some level of arbitrariness is unavoidable. A lot depends on the capabilities we believe are necessary in order to have a minimally decent life, and that’s controversial.
I also understand that social norms evolve and that basic needs can change over time. Several centuries ago a microwave and a cellphone were obviously not a basic need; now you will be considered poor if you lack these tools. In a pre-modern agrarian society, you would have been considered poor only when you were on the brink of starvation. You didn’t need technological tools, child care, education etc. in order to have a minimally decent life, because no one had those things and your functioning in the economy didn’t require them. Today, if you don’t have them, you’ll feel excluded, less than normal, weird, “trash” and in certain cases you’ll end up deeper in poverty because you’ll have a hard time finding a job if you don’t have a car, a cell phone or child care.
Also, why shouldn’t we become more ambitious over time? Should we be content if we’re able to avoid only the worst kind of deprivation? Or should we try to continually improve many different capabilities? The latter is I think a sign of civilization and progress. That doesn’t mean we should scatter our attention and forget to focus on the worst deprivation. It only means we shouldn’t stop after we’ve dealt with the worst. And we haven’t dealt with the worst simply because the percentages of those worst off have been coming down (see the numbers cited above). Indeed, a smaller share of the world’s population suffers from low income than some time ago. But because of population growth – which is a good thing resulting from higher life expectancy rates – the total number of people with low income is now higher. And total numbers also count, just as much as percentages. As Thomas Pogge has argued, the Holocaust wouldn’t be any less horrible if it turned out that the number of people killed was a smaller percentage of the world’s population than initially thought.