Why did Charles Booth, a Liverpool ship owner, conduct the first social survey of low-skilled workers in the East End of London in 1887?

Poverty was not unknown in the countryside, it was more concentrated and starkly visible in the city. Thus, in 1887, Charles Booth, a Liverpool ship-owner, conducted the first social survey of low-skilled London workers in the East End of London to know the population of poor people and up to how many years they would live compared to rich people.