Assessment 2 - Step 1 - KCQ's

Contribution margin

Contribution margin is the breathing room in a business. The portion of each sale that covers fixed costs and, if there’s anything left over, becomes profit.

During my time working in residential construction, we added that contribution margin transparently to project quotes, as a flat 20% builder’s margin on materials and labour. That margin had a very practical job, paying for the fixed costs we couldn’t attach to a single invoice, like insurance, vehicles, tools, office wages, and rent. If a project ran smoothly, some of that margin became profit. If we hit delays or missed items in the quote, the margin was quickly eaten up covering those mistakes. There was no incentive to push one product over another. The goal was consistent coverage of fixed costs and risk.

Luxury brands flip that logic entirely. Fashion houses like Hermès and LVMH use scarcity, craftsmanship, and status to convince customers that their products are worth far more than their variable input costs. That allows them to set prices well above what it costs to produce each item, increasing the contribution margin per unit. They still carry significant fixed costs. For example, design teams, endorsements, fashion shows, and flagship stores that only admit a handful of customers at a time.  However, these fixed costs consume a relatively small portion of the contribution margin, leaving a much larger share as profit.

Construction relies on a uniform margin to reliably cover fixed costs. Luxury brands, by contrast, engineer perceived value to expand the gap between cost and price.  So, to anyone considering starting a residential construction firm, I’d suggest pivoting to founding a multi‑generational, luxury European fashion house. Or, more realistically, spend some time investing in branding and perceived value, because increasing contribution margin is not only about reducing costs, it’s also about what customers believe your product is worth.

Product costs vs Period costs

Product costs and period costs divergence are about reflecting when a cost shows up as an expense.

Product costs are the costs directly tied to creating something you can sell. Think materials, direct labour and other costs involved in building a product. These costs don’t hit the profit and loss statement straight away. Until the product is sold, they sit on the balance sheet as an asset, because they represent future economic benefit. You’ll often see them parked under labels like work in progress or finished goods inventory. Those product costs only become an expense once the product is actually sold. At that point, they move out of inventory and into cost of goods sold.  The cost conveniently waits until the revenue shows up.

Period costs work differently. These are costs tied to time, not production, think rent, insurance and council rates. They don’t create inventory and can’t be attached to a specific product, so there’s no future benefit to store up. Because of that, period costs are expensed as soon as they’re incurred, regardless of how many products are sold that period. This distinction affects both reported profit and decision‑making. Product costs follow the product. Period costs follow the calendar. Understanding which bucket a cost falls into,

helps explain why a business can look profitable one month and not the next, even when cash hasn’t really changed.