Lol mathematically much of his advice sucks.

Anything can go well 1 time, doesn't change the fact that in the grand scheme of things pocket 2's are the inferior hand & one has a higher mathematical probability of loosing that hand than winning it.

I need a better bookkeeping system (mathematics is NOT a hobby of mine;) and this sounds promising.

I am a Certified Public Accountant (CPA, Illinois) and Chartered Accountant (CA, Canada), recieved a Bachelor of Mathematics degree, and a Master of Accounting degree from the University of Waterloo located in Ontario, Canada.What is your background and current real estate focus? 

For those of you who've had similar options, what kind of difference do you look for from mathematical perspective in order to decide whether to sell or rent?

That said, there is areas in explosive growth pattern, support by planned city development, and for the smarty-pant's who put int he work to know those plan's ("ehe-hum") appreciation becomes a mathematical item vs guess-work. 

Now, I finally have an explanation that makes perfect sense mathematically.

But i'm getting better at giving her mathematically backed answers and she's slowly coming around.

Mathematically, it should be relatively easy to run your numbers and see what your return-on-investment is.

This is the one reason why I utilize this because it's absolutely predictable that it will follow a Financial Mathematical Schedule of Principal and Interest Payments, as well as Balance reduction.Because the Amortized Mortgage is absolutely predictable, and I for one follow the RULE "If you can Predict it, you can Profit from it", I actually look to Maximize this within reason.So while I put down 20% for an Investment Property to maintain a level of skin in the game and reduction of risk by having an attractive interest rate, I generally take about mortgages around $1 Million or above.That is because the Mortgage, being paid by my renters, will follow a very predictable path, one which will make me a millions as each one gets reduced or paid off.In fact, if you receive ZERO cashflow but your Million dollar Mortgage disappears in 30 years, you have effectively made an average of $33,333 PER YEAR for 30 YEARS.And, if you consider that the Mortgage Interest is deductible, especially for a Rental Real Estate Business, you have earned even more than the Million dollar mortgage.For some reason, this kind of thinking is not taught ANYWHERE that I have seen.