DEMAND FORECAST

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DEMAND FORECAST

Definition

  • Optimizing inventory: Accurate forecasting prevents stockouts (loss of revenue) and overstocking (tied-up capital, damage).
  • Tailoring promotions: Understanding natural demand allows you to measure the incremental effect of a promotion.
  • Managing margins: adjusting prices based on projected demand maximizes revenue (yield management).

Real-world example

A clothing retailer forecasts demand for its summer collection starting in January

The models incorporate data from the past five years, fashion trends (NLP analysis of social media), regional weather forecasts, and the sales calendar

For a specific T-shirt model, the forecast is 28,000 units for the season, with a peak in mid-June

This forecast guides supplier purchases (32,000 units ordered with a 15% margin), logistics planning, and promotional windows.

How to measure and use it

A robust forecast combines several approaches: traditional statistics (moving averages, ARIMA, Holt-Winters), machine learning (gradient boosting, recurrent neural networks), and domain expertise (category manager judgment)

Modern tools use hybrid architectures that weight these sources based on context

Accuracy is measured by MAPE (Mean Absolute Percentage Error), with typical targets ranging from 5% to 25% depending on the product’s stability.

Common pitfalls

  • Underestimating external factors: a model that doesn't account for weather, holidays, or competitors' promotions misses key variations.
  • Forecast at only one level: forecasts must be available at the SKU, store, and category levels, with consistent trade-offs.
  • Failure to measure performance: without monitoring the MAPE and conducting regular back-testing, it is impossible to know whether the model is deteriorating.

Further reading

  • Research & Data: Using AI for sales forecasting to build robust models.
  • Solutions: Pricing Analytics to link demand forecasting with pricing decisions.
  • Tip: Pricing training to equip your teams with the skills to interpret forecasts.
  • Resources: Check out our pricing FAQ to learn how to combine forecasting and yield management.

FAQ

For stable products, aim for a MAPE of less than 10%. For new products or volatile seasonal items, 20 to 30% is acceptable. Accuracy also depends on the forecast horizon.

At the SKU x store x week level for operations, at the category x month level for sales planning, and at the product family x quarter level for purchasing.

Using an "uplift" model that distinguishes between natural demand—known as the baseline—and the promotional effect. This makes it possible to accurately predict the impact of a future promotion.

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