I liked this film, but two nits to pick....
I didn't like that Ahmad quit the job Mohammed got him with Manish (I think that's the name). Some here have suggested he felt that it was demeaning and that Manish was taking advantage of him. Perhaps, but it probably paid better and was easier to do than his cart job (at that point, he could have sold the cart or used it periodically for extra cash, or rented it out).
The second thing that bothered me is that he didn't get the cart insurance. If he'd finally paid off the cart, he should have had the cash to pay for the insurance, which would have had to be less than the money he set aside to buy the cart (and yes, I know he got the last $500 from Mohammed).
All in all, this film reminded me quite a bit of the Dardenne brothers' 'Rosetta;' which came first and was actually better I thought.
Still, after watching this, I felt awfully fortunate.