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; The Basics - Doubling Time   has the formula that we will fit everything into; the one that banks use to calculate "daily interest" in accounts:  A = P(1 + r/n)nt where the symbols mean

A (; answer at bottom) is given by

your original P=\$10k () invested at

interest rate of r=7%/yr(

compounded n times per year ( )

and sitting there for t years ( ):

Notice that setting n=a zillion (continuous) eliminates it and changes the formula to A = Pert. the formula for the market websites show us.

EXERCISE: Experiment with the interest rate  and number of years to retirement . What appears above is the result for ten k invested in an ETF called HAC.TO and just left sitting there. Try various other times - to - retirement, using your entire RRSP-room for P. Result A = ][]54[.

Try an "interest rate" of 10%/yr which we have recently been getting by holding banks. There are several ETF choices below which return about that much.

Try an aggressive rate of 20%/yr which we have been getting from an ETF holding Amazon, Google etc. in the list of ETFs. Here is the pattern you will find:

Divide the %/yr growth rate into 70 to estimate doubling time.

Caveat: the above numbers do not take into account the effect of inflation.