Define a monopoly.

Step 1: Define a monopoly. A monopoly is a market structure characterized by a single seller producing a unique product with no close substitutes, and significant barriers to entry that prevent other firms from competing. Step 2: Identify Eskom as the primary electricity supplier. Eskom is largely regarded as a monopoly in South Africa because it is the sole generator and bulk distributor of electricity in the country. While there are some independent power producers, Eskom controls the vast majority of the generation capacity and the entire national transmission grid. Step 3: Discuss high barriers to entry. The electricity sector has extremely high barriers to entry. These include the massive capital investment required to build power plants and transmission infrastructure, the need for specialized technical expertise, and the extensive regulatory approvals and licenses required to operate. These factors make it nearly impossible for new firms to enter and compete effectively with Eskom. Step 4: Explain the unique nature of the product. Eskom provides a unique and essential service – electricity – which has no direct substitutes for most industrial, commercial, and residential uses. This lack of close substitutes gives Eskom significant market power. Step 5: Mention government ownership and regulation. As a state-owned enterprise, Eskom operates under a specific mandate and regulatory framework that historically granted it exclusive rights to generate and distribute electricity, further solidifying its monopolistic position. That's 2 down. 3 left today — send the next one.