Assignment Two: Step Three

Step Three: Contribution Margin Analysis

Assignment Two: Step Three

Introduction to Contribution Margin Analysis

Ok so contribution margin, the gravy we work for- the profit that is left over? Right? I am more confused than ever, but delighted to be able to go explain to my husband why our bank account isn’t reflecting Gina Rienhardts… yet… As I worked through this analysis in the context of Briscoe Group, it became clear that the contribution margin is less about the arithmetic and more about understanding which sales actually matter once the business is stripped back to its economic essentials. This mirrors how financial decisions are often assessed in practice particularly when evaluating capital investments. Rather than focusing on total revenue, attention shifts to what remains after the costs that move with each sale are removed.

What stood out for me is how closely contribution margin thinking aligns with real-world decision-making in small business. Some costs fluctuate every time a product is sold, while others remain largely unchanged regardless of sales volume. Recognising this distinction brought clarity to how Briscoe Group’s profitability is generated and why certain products can be strategically important even though they may not dominate headline sales figures.

Contribution margin analysis therefore focuses on identifying the portion of revenue that remains after variable costs are deducted. The remaining margin contributes toward covering fixed operating costs such as store rents, salaries, electricity, marketing, IT systems, and administrative overheads. It is only once these fixed costs are covered that a business begins to generate profit.

Rationale of Product Selection

To deepen and illustrate contribution margin in a meaningful way, three product’s have been selected across Briscoe Group’s major retail categories: furniture, small appliances, and sporting goods. These categories were chosen as they differ significantly in price point, purchase frequency, and cost structure, allowing for a clearer comparison of how margin behaviour varies across Briscoe Group.

1.      Mattresses represent a high-value, low frequency purchase with substantial dollar margins

2.      Air fryers are a popular small appliance with moderate pricing and string exposure to promotional discounting

3.      Running shoes reflect a repeat-purchase sporting good with relatively consistent demand and steady turnover

Collectively, these products provide a balanced view of how contribution margin interact with both price and volume across Briscoe Group’s operations.

Contribution Margin Table

Product	Typical selling price (NZD)	Estimated variable cost per unit (NZD)	Contribution margin (NZD)	CM ratio
Mattress	$1,595	$680	$915	57.3%
Air fryer – Briscoes Homeware	$199	$120	$79	39.7%
Running shoes – Rebel Sport	$179	$95	$84	46.9%

Variable costs in this analysis include supplier costs, freight, and handling, which typically increase directly with each unit sold. Fixed costs such as store rent, wages, electricity, marketing and system infrastructure are excluded from the calculation and are instead covered by the contribution margin generated by sales.

Furniture and home goods retailers typically report gross margins of 40–60%, while high-value items like mattresses often have contribution margins above 50% due to low variable costs (Ratio, 2025).  Retail industry benchmarks indicate small appliance categories commonly operate with gross margins of 25-45%, aligning with contribution margin calculated. Some datasets suggest that footwear and accessories categories approach 47.5% especially in stores that sell premium brands such as Rebel Sport, supporting the plausibility of the contribution margin figures used here (Ratio, 2025).

Analysis of Contribution Margins

Mattresses are a real standout in this analysis, boasting a hefty contribution margin of $915 per unit and topping the chart with a margin ratio of 57.3%. In other words, only a small slice of the selling price goes towards variable costs, so each mattress sold makes a big dent in covering overheads like shop leases, full-time staff, electricity, marketing, and head-office systems. While mattresses have a powerful impact on overall profit when sold, they’re a classic “big-ticket” item, customers buy them infrequently, so sales are less predictable and volumes are lower, despite the strong margins.

Running shoes, on the other hand, show a healthy contribution margin ratio of 46.9%, meaning almost half of each sales dollar goes towards covering fixed costs and building profit. The dollar margin per pair ($84) isn’t as high as mattresses, but shoes tend to sell more often and see a lot of repeat business. That steady turnover makes the category especially useful for reliably chipping away at ongoing costs like rent, wages, and utilities, and helps keep profit flowing consistently.

Air fryers come in with the lowest contribution margin ratio at 39.7%, mainly due to the higher variable costs you often find in small appliance retailing. They still do their bit to cover fixed costs, but they’re more exposed to changes in promotional pricing. If air fryers are heavily discounted, margins can erode quickly, so shifting a lot of units won’t always lead to strong profits unless pricing is managed carefully.

Overall, this analysis highlights that true profitability isn’t just about racking up revenue, it comes down to how margin structure and sales volume work together. The contribution margin gives a clearer view of which products are really pulling their weight in covering the business’s fixed costs and creating room for profit.