Swift was so, so, so smart and also hilariously funny. Recently I learned that he was one of the early progenitors of micro-credit. He started the Irish Loan Funds in the early 1700s to provide credit –without collateral — to the poor of Dublin. These loan funds started on a charitable basis but continued to grow and play a positive role in alleviating Irish poverty throughout the nineteenth century. Here is one account. Here is a broader piece on the history of microfinance. Here is a history of the Irish Loan Funds.
Here is Swift on reforming the coinage.