1. A process for determining a real estate or business price using an infinite spreadsheet involving a plurality of buyers each occupying a finite duration (investment period) on said infinite spreadsheet and each having a price and a resale price for each finite duration, the process comprising the steps of: a) Choosing a set of initial input values of financial factors in the determination of the price of the real estate or business for the determination of the cash investment return, which is equal to the cash flows plus the cash from resale; b) Projecting the net income to the last or Tth year where T is finite and an integer multiple of a constant investment period or equals the sum of all the distinct investment periods represented by t.sub.1, t.sub.2, t.sub.3,. .. , t.sub.n-1, t.sub.n ; c) Finding the final price at the Tth year by an iterative process described in f) to k) below using inputs derived from an equivalent stable financial condition, in which the resale price increases at the same rate as the net income, which increases at a constant rate to infinity in time; d) Projecting the net income from the last or Tth to (T+t.sub.n+1)th year; e) Determining the ratio of the price (price at T) and the resale price (price at T+t.sub.n+1) of the investment period from T to T+t.sub.n+1 from the ratio of the net income at T and the net income at T+t.sub.n+1 ; f) Picking a trial price for the Fth year and determining the trial resale price (price at T+t.sub.n+1) as the trial price multiplied by the ratio of the net income at T and the net income at T+t.sub.n+1 ; g) Projecting the cash flows and the sum of cash flows from the trial price, projected income, expenses, and other financial factors from the last or Tth to (T+t.sub.n+1)th year; h) Determining the last year cash from resale using the resale price; i) Adding the cash from resale to the sum of cash flows from g); j) Checking if the calculated average rate of return on investment, which is determined from the cash flows based on the price and the cash from resale based on the resale price is within a pre-assigned accuracy of the expected average rate of return on investment; k) Repeating f) to j) if j) does not check, until j) does check thus indicating a correct price for the Tth year; l) Using the price of the real estate or business found in k) as the resale price in the determination of the price for the (T-t.sub.n)th year where t.sub.n is the investment period from the (T-t.sub.n)th to the Tth year; m) Advancing backwards in time by repeating f) to l) for the (T-t.sub.n -t.sub.n-1)th and all prior years to find all resale prices; n) Determining the present price of the real estate or business as the final iteration of step k) when the sum of all the investment periods t.sub.1 +t.sub.2 +t.sub.3 +. .. +t.sub.n-1 +t.sub.n =T.