What the report covers

The assignment is a strategy-theory paper: five forces plus scale and scope. It is not a Netflix five-forces reprint and not an Apple competitive-advantage case. Those firm papers are separate assignments.

Define the tools first, then show how a cost advantage can raise entry barriers or change rivalry, then state the limits.

The five forces

Porter's 1979 and 1980 work asks how the structure of an industry shapes the average firm's room for profit. Each force has drivers — switching costs, concentration, uniqueness of the input or the substitute — that should be named rather than scored in a vacuum.

A common weakness is to treat 'rivalry' as the only force, or to describe a single company as if it were the industry.

Scale and scope

Economies of scale appear when spreading fixed costs, or specializing, lowers average cost as volume rises. They can be a barrier to entry if a new firm cannot reach a comparable volume. They can also disappear if demand is too small or if coordination costs rise.

Economies of scope appear when shared capabilities or shared processes make two lines cheaper together than apart. A student paper should give a qualitative example — a shared plant, a shared logistics network — and not invent a cost curve.

Limits

The five-forces snapshot can miss complements, platforms, and rapid technical change. Scale is not automatically efficient, and scope is not automatically synergy. End with one industry you actually know enough to describe, or with a clearly labelled hypothetical, and cite published figures only.

Sources

1. Porter, M. E. (1979). How competitive forces shape strategy. Harvard Business Review, 57(2), 137–145.
2. Porter, M. E. (1980). Competitive strategy. Free Press.
3. Panzar, J. C., & Willig, R. D. (1981). Economies of scope. American Economic Review, 71(2), 268–272, together with a standard microeconomics text for economies of scale.

Last updated: November 13, 2026