Around half of the world’s slaves are held in debt bondage in India, Pakistan and Bangladesh. Debt bondage is a very old form of slavery in which radically marginalised members of society, often from India’s ‘untouchable’ caste, must trade all their labour for single small infusions of cash.
Link : https://aeon.co/essays/this-is-what-slavery-looks-like-today-in-the-eyes-of-slavers