Despite the law of demand, pointing to increased demand for a price rise is a “bad” reason: it has the biggest negative effect on customer satisfaction and eagerness to buy a product. This is especially the case for a sector like telecommunications where the retailer doesn’t really have significant supply constraints.

By contrast, the best way to fend off angry customers is to either blame it on cost increases which “have to” be passed on, or to say the price increase covers extra costs needed for product development. Essentially, it has to be either something out of a business’s control, or aimed at improving the customer’s experience.

The worst thing a business can do is give no reason at all and hope no one notices (or, as Coles and Woolies have allegedly done, hide those price rises beneath false discounts, eroding customers’ trust). A 20 per cent price rise with the explanation that you’re investing in the product has the same effect on sales as a 4 per cent price rise with no explanation.

Even something as vague as “due to recent circumstances” is better than nothing. Did the dog eat your conveyor belt? Or is it because of a global supply shock? Who knows – but it works because at least the business is showing the decency to own the price increase. Openness and honesty count for something.

Time-poor and lazy

It also depends on the sector. Dectech’s study found raising prices “to invest in the product” worked especially well for the grocery and airline sectors – at least in the UK. Why? “People want to see better ready-made meals and new aeroplanes,” the authors said.

We also know humans aren’t big fans of change. We’re creatures of habit, often preferring to stick to routine or with what we know. Independent Australian economic research institute e61’s economist Matt Elias took a peek into consumer bank transactions linked to store locations and found there was a “persistent degree of inertia” when it comes to our supermarket choices.

Chances are, even if you have multiple options, you stick with one of the big two: Coles or Woolworths. It’s hard to pinpoint why, but Elias says it could reflect the fact that comparing prices between supermarkets can be tricky: there are so many items which are changing in price from week to week.

Consumers are also time-poor and – let’s face it – lazy. How often do you pull up the websites or catalogues of the major supermarkets to optimise your shopping? Probably not as much as you should or could.

Fluffy handcuffs

Brand loyalty can trap consumers, and unfortunately, it can reduce competition, handing more market power to big companies such as Coles and Woolworths. Why? Because when customers refuse to shop around, there’s less pressure on businesses to offer the best prices.

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One way to combat this, Elias says, is to set up a government-supported digital price comparison platform, similar to the websites and apps we have to compare fuel prices. When these systems have been set up overseas, they’ve resulted in lower prices.

Loyalty cards or reward apps can worsen customers’ inertia, acting like fluffy handcuffs. They lock in consumers who would otherwise be more inclined to shop around for the best deal by offering enticing rewards for being faithful. Why cut prices when your customers are busy spending at your store to rack up points?

While economists like to assume people are perfect bargain-hunters, helping to keep companies on their toes and prices in check, the reality is blurrier. From inertia to justifications and loyalty cards, our behaviour is shaped by more than price. Being aware of some of what makes us tick (or sit back) can help businesses make money – but it can also help us save it.

Ross Gittins unpacks the economy in an exclusive subscriber-only newsletter. Sign up to receive it every Tuesday evening.