Which entity controlled diamond production to stabilize prices in the late 19th century and established a single channel market?

• A. De Beers Group
• B. World Diamond Council
• C. Diamond Trading Company
• D. London diamond syndicate

Answer: (D)

The key idea here is how a group could curb wide price swings by controlling the flow of rough diamonds and shaping how they moved from mines to buyers, effectively creating one main route for sales. In the late 19th century, a network of leading London diamond merchants formed the London diamond syndicate to coordinate purchases and sales, set prices, and allocate production. This collective control reduced volatility and established a centralized channel for distributing rough diamonds, which is what is meant by a single channel market.

That arrangement was the early mechanism that centered market power in a defined group and stabilized prices through coordinated supply, setting the stage for later, more formalized control. While De Beers later consolidated dominance and later created a named trading arm to maintain a single channel, this specific late-19th-century syndicate is the entity most closely associated with the described shift in control and market structure at that time. The other options reflect later organizations or different roles in the industry and do not fit the late-19th-century context.