Why is it that when using the dividend dicount model, sometimes you multiply the dividend by (1+g) before dividing by price and other times you just divide by price without multiplying by (1+g)?

Specifically in reference to Schweser Concept Checkers (9 and 15) for Reading 37.

The key is to remember that the price of a share of common stock (or of a bond, for that matter) is the present value of expected FUTURE cash flows. The Constant Growth Formula is simply the formula for the present valueof a growing perpetuity: PV at time “t” = Cash Flow at time “t+1”/(r-g). In this case, the cash flow is the dividend.

So if you are given the most recent dividend, you need to convert it by multiplying by “1+g” to get the next expected dividend. If you are given the next exected dividend, you don;t need to multiply by “1+g”.

Its simple, If you have given in the question D0 dividend for the present year you need to convert this into D1 dividiend for the next year by multiplying (1 + G ). And hence if D1 is given you not need to multiply by ( 1+ G ) today.