Yes -- two parties are permitted to lend money to one another in a mutually agreed environment. It's important to note, though, that developers who build end-user applications on top of Dharma ought to be cognizant of lending regulations / securities law in the jurisdictions they are active in. However, we've opted to build Dharma in a non-jurisdictionally-biased manner -- we think that jurisdiction-specific regulatory restrictions are better implemented at the application layer rather than the protocol piping.