level of the underlyinginstrument. Autoregressive Using past data or variable of interest to predict future values of the same variable. Auto-Regressive (AR) Process A stationary stochastic process where the current value of the time series is related to the past p values, where p is any integer, is called an AR(p) process. When the current value is related to the previous two values, it is an AR(2) process. An AR(1) process has an infinite memory. Autoregressive Conditional Heteroskedasticity (ARCH) A nonlinear stochastic process, where the variance is time-varying, and a function of the past variance. ARCH processes have frequency distributions which have high peaks at the mean and fat-tails, much like fractal distributions. The ARCH model was invented by Robert Engle. The Generalized ARCH (GARCH) model is the most widely used and was pioneered by Tim Bollerslev. See: Fractal Distributions. Availability The period in which the project financing is available for drawdown. Availability float Checks deposited by a company that have not yet been cleared. Available cash flow Total cash sources less total cash uses before payment of debt service. Available on the way in In context of general equities, stock is available to new customer as trade initiated by another customer is about to be consummated (on the exchangefloor). Usually said to an inquiring salesperson. See: Open. Aval Term meaning inseparable from the financialinstrument. This gives a guarantee and is abstracted from the performance of the underlying trade contract: Article 31 of the 1930 Geneva Convention of the Bills Of Exchange states that the aval can be written on the bill itself or on an allonge. US Banks are prohibited from avalizing drafts. Avalizor An institution or person who gives the aval. Average An arithmetic mean return of selected stocks intended to represent the behavior of the market or some component of it. One good example is the widely quoted Dow Jones Industrial Average, which adds the current prices of the 30 DJIA stocks, and divides the results by a predetermined number, the divisor. Average accounting return The average project earnings after taxes and depreciation divided by the averagebook value of the investment during its life. Average (across-day) measures An estimation of price that uses the average or representative price of a large number of trades. Average age of accounts receivable The weighted-average age of all the firm's outstanding invoices. Average collection period, or days' receivables The ratio of accounts receivables to sales, or the total amount of credit extended per dollar of daily sales (average AR/sales 365). Average cost In the context of investing, refers to the averagecost of shares or stock bought at different prices over time. Average cost of capital A firm's required payout to bondholders and stockholders expressed as a percentage of capitalcontributed to the firm. Average cost of capital is computed by dividing the total required cost of capital by the total amount of contributed capital. Average daily balance A method for calculating interest in which the balance owed each day by a customer is divided by the number of days. See also: Adjusted balance method