Estimate how many slaves work for you based on your possessions and lifestyle.

http://slaveryfootprint.org/about/#methodology

They appear to count "N slaves working for you" if they predict N slaves were involved in the production of anything you have, not the number you keep continuously employed.

For instance, if I buy a diamond ring, I am not responsible for lives taken with weapons that have been bought with diamonds. If I drink Coca-Cola, I am not responsible for some obscure branch of the Coca-Cola Company which seizes the drinking water source of an entire village. If I pay for sex in Norway, that doesn't mean I am responsible for children being forced to sell their bodies in sex trafficing. Except in a few narrow cases where law enforcement gets involved, I never even see these children.

In each of these instances, there are real wrongs commited - but the wrongs are perpetrated by people who are a lot more unscrupulous than me. It is a fallacy to claim that the end user of products of industries where bad things sometimes happen, does something wrong. Everyone has a moral responsibility, but this responsibility doesn't carry over all the way.

Does anyone really think that the Indian microfinance debt collectors who force children into prostitution will suddenly become upstanding citizens if "microfinance" companies are banned? These problems need to be addressed at the source. Moral judgements like the ones implied in this app are a huge fallacy. Things will not get better if demand for strictly unnecessary goods and services suddenly disappears.