Michael Greve: The Power to Lend?Michael Ramsey

At the Liberty Law Blog, Michael Greve asks:

The Constitution provides Congress with the power to tax (and presumably to spend), for specified purposes; to borrow money on the credit of the United States; and to dispose of the property of the United States. Question (especially to my originalist friends and to experts in constitutional history): Is there a power to lend? If so, where does it come from?