ISG Sommelier study materials
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ISG Sommelier: Global beverage business and management

ISG Sommelier · Work through your exam, one topic at a time.

All guide sections

Global beverage business and management

Global beverage business and management covers the commercial side of the role: costing, pricing, inventory, menu engineering, distribution structures and staff performance.

Core metrics

  • Beverage cost percentage = cost of goods sold ÷ beverage sales.
  • Pour cost per serve = bottle cost ÷ number of serves per bottle.
  • Contribution margin = selling price − cost.
  • Inventory turnover = cost of goods sold ÷ average inventory value. Target beverage cost varies by venue but often sits between 18% and 30%; by-the-glass programmes run higher because of spoilage.
  • Markup is a multiplier on cost; margin is a percentage of price. They are not interchangeable.

Menu engineering

Classify items by popularity and contribution margin: stars (popular, high margin) promote; plowhorses (popular, low margin) re-cost or reprice; puzzles (unpopular, high margin) reposition or train staff to sell; dogs (unpopular, low margin) remove.

Distribution

The United States uses a three-tier system of producer, distributor and retailer, with state variation. Canada and the Nordics use monopoly retail. The EU generally permits direct sales and supermarket retail. Allocation and scarcity drive pricing for cult wines.

Worked example

A bottle costs $12 and sells whole for $48: pour cost is 12 ÷ 48 = 25%, margin $36. If the bottle yields five 150 ml glasses costing $2.40 each and selling at $12, pour cost is 20%, margin $9.60 per glass, $48 across the bottle - more revenue and margin, but with spoilage risk.

Traps

Confusing markup with margin. Leaving spoilage, breakage, staff pours and comps out of real cost. Discounting high-margin items instead of slow, low-margin stock.