Prudent: Acting with and showing care and thought for the future.
I'm definitely not prudent in the traditional sense. But I'm massively future aware, and not clumsy with decisions, even though I don't always play low risk. If you asked me, am I now or am I likely to be in any real trouble financially, I'd probably say no. My account will run low from time to time, but I always know the options and back ups, and I always have plans to improve future income and organisation. Like I'm constantly aware of where things stand. I don't carry debt around like most of my friends either.
My father (INTP) is one of the most prudent people I know, in the normal sense of saving, taking too much care, and analysing every decision before making it. I'm guessing INTPs are normally quite good financially, though so low risk that I couldn't see him becoming extremely rich.