https://arxiv.org/pdf/1507.07064.pdf
Please, read this article and explain with simple words (no jargon)
1) How Random Serial Dictatorship Quota Mechanism satisfies pareto optimal (pareto efficient ex post), strategyproof, and envy-free up to one item (EF1) with proof using contradiction.
2) describe model
3) suggest example that shows the steps of the mechanism.