Estimating Total Sales

Management needs to estimate whether sales will be high enough to yield a satisfactory profit. Total estimated sales are the sum of estimated first-time sales, replacement sales, and repeat sales. Sales-estimation methods depend on whether the product is a one-time purchase (such as an engagement ring or retirement home), an infrequently purchased product, or a frequently purchased product. For one-time purchased products, sales rise at the beginning, peak, and later approach zero as the number of potential buyers is exhausted (Figure 2-5). If new buyers keep entering the market, the curve will not go down to zero.

Infrequently purchased products—such as automobiles, toasters, and industrial equipment—exhibit replacement cycles dictated by physical wearing out or by obsolescence associated with changing styles, features, and performance. Sales forecasting for this product category calls for estimating first-time sales and replacement sales separately (Figure 2-5).

Frequently purchased products, such as consumer and industrial nondurables, have product life-cycle sales resembling Figure 2-5. The number of first-time buyers initially increases and then decreases as fewer buyers are left (assuming a fixed population). Repeat purchases occur soon, providing that the product satisfies some buyers. The sales curve eventually falls to a plateau representing a level of steady repeat-purchase volume; by this time, the product is no longer a new product.

In estimating a new product's sales, the manager's first task is to estimate first-time purchases of the new product in each period. A variety of techniques is available. To estimate replacement sales, management has to research the product's survival-age distri-bution—that is, the number of units that fail in year one, two, three, and so on. The low end of the distribution indicates when the first replacement sales will take place. The actual timing of replacement will be influenced by a variety of factors. Because replacement sales are difficult to estimate before the product is in use, some manufacturers base the decision to launch a new product solely on the estimate of first-time sales.

For a frequently purchased new product, the seller has to estimate repeat sales as well as first-time sales. A high rate of repeat purchasing means that customers are satisfied; sales are likely to stay high even after all first-time purchases take place. The seller should note the percentage of repeat purchases that take place in each repeat-purchase class: those who rebuy once, twice, three times, and so on. Some products and brands are bought a few times and dropped.18

Avoiding Credit Card Disaster

Avoiding Credit Card Disaster

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