Lesson 9: Comparing Prices
Two shops can sell the same item at very different prices, and two sizes of the same product can offer very different value. Learning to compare prices properly is one of the fastest ways to save money, because it costs nothing and works every time you shop. The skill has three parts: comparing like with like, working out the price per unit, and remembering that the cheapest price is not always the best deal.
Comparing like with like means checking that you are really comparing the same thing. A cheaper phone may have a smaller battery, less storage or a shorter guarantee; a cheaper pair of shoes may wear out in months while the dearer pair lasts for years. Before comparing prices, compare the products: brand, size, quality, guarantee and what is included. Only when the products are genuinely similar does the price comparison mean anything. This is also why reading the label matters — the weight, the number of items, and the ingredients or materials are all printed there for a reason.
Unit Pricing: The Fair Comparison
When two packs of the same product come in different sizes, the smaller price tag usually belongs to the smaller pack — but that tells you nothing about value. The fair comparison is the unit price: the price for one unit, such as one gram, one litre or one item. To find it, divide the price by the quantity. For example, a 16-ounce bottle costing 4 units has a unit price of 4 divided by 16, which is 0.25 per ounce. A 35-ounce bottle of the same product costing 7 units has a unit price of 7 divided by 35, which is 0.20 per ounce — the bigger bottle is the better deal, even though it costs more overall. Many shops print the unit price on the shelf label, so look for it before you decide.
When Cheapest Is Not Best
Unit price settles which pack is cheaper, but it does not settle everything. A huge pack is a bad deal if the product goes stale before you use it, or if you cannot store it, or if buying it leaves you short of money for other needs. A very cheap item that breaks quickly can cost more in the long run than a dearer one that lasts — this is the idea of the total cost of ownership, the full cost over the whole life of a purchase. The wise shopper asks three questions: is this the same product, what is the price per unit, and will I actually use it all? Answer those three, and you will rarely overpay.
Key Terms
- Unit price
- The price of one unit of a product — per gram, litre or item — found by dividing the price by the quantity.
- Comparison shopping
- Checking the price of the same product in different shops or sizes before buying.
- Total cost of ownership
- The full cost of owning something over its whole life, including repairs, running costs and replacement.
- Guarantee
- A promise from a seller or maker to repair or replace a product if it fails within a stated time.
- Value for money
- How much usefulness or quality you get for the price paid — not simply the lowest price.
- Quantity
- How much of a product there is — its weight, volume or number of items.
Discussion Questions
- A shop sells the same rice in a 1 kg bag and a 5 kg bag. How would you work out which is better value, and what else would you check first?
- When might buying the cheapest version of something end up costing more in the long run?
- Why do you think shops sometimes make it hard to compare prices between products?
Practice Questions
- What is a unit price, and how do you calculate it?
- A 16-ounce bottle costs 4 units and a 35-ounce bottle of the same product costs 7 units. Which is the better deal, and why?
- Why must you compare like with like before comparing prices?
- What is total cost of ownership, and how can it change which item is the better buy?
- Give one reason why the biggest pack is not always the best choice.
Show answers
- Unit price is the price of one unit of a product. Divide the price by the quantity — for example, price per ounce, per litre or per item.
- The 35-ounce bottle. Its unit price is 7 divided by 35 = 0.20 per ounce, while the small bottle is 4 divided by 16 = 0.25 per ounce.
- Because a cheaper product may differ in quality, size, guarantee or contents. A price comparison only makes sense for products that are genuinely similar.
- Total cost of ownership is the full cost over the product's whole life. A cheap item that breaks quickly and must be replaced can cost more than a dearer one that lasts.
- Any one of: it may go stale before you use it; you may not have space to store it; buying it may leave you short of money for other needs.