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D(1+g)/k^t – Multistage DDM, use this when there are multiple periods w/ different dividend growth rates that need to discounted back along w/ PN (once growth levels off) to solve P0.

D1/k-g – Constant growth/Gordon, use this when g is constant to solve P0 (mature, established companies).

D1/P0 + g – similar to the above w/ formula rearranged to solve for k/yield. If preferred, g = 0.

g = ROE x Retention Rate

Earnings Multiple = payout rate/k-g