Refinance or not: a loaded question

the simple way to calculate this is to calculate the entire cost of two loans and compare it to see if it save money (rememeber to substract the cost of refinance when doing this).

unfortunately, a lot of people are even confused about that:)

Now the hard question is as followed:

1) how do you consider the time value of money? is money now give you more power than money later?

2) what's future inflation outlook of the US currency? how about deflation if any? it looks like we have one now.

3) what is power of cash now or in the near future? if current deflation continues, i can see tremendous power of cash. Cash will give you power you could have never believed of. i am talking about real estate investing here.

4) what is your future earning power when you retired? it has to do with tax implications when the loan is paid off..

Who can answer all questions correctly? I don't think any loan agent in the world can answer these questions well.