A reserve changes the price

Buying consumables in advance is sometimes cheaper than buying them at the moment of urgent need.

But a stock saves money only under several conditions:

• the goods will definitely be used;
• they will not spoil;
• there is room;
• the discount is real;
• the stock will not increase consumption;
• the money is not needed for something more important.

Ten packs of a product on offer are not a saving if half of them get thrown out.

A financial reserve works in a similar way, but its function is broader.

It lets you survive a delay in income, pay for a sudden repair, quit a bad job, buy what you need without an expensive loan, take up a good opportunity and make decisions without immediate panic.

The size of the reserve depends on the stability of your income, on family, housing, insurance and the support available to you. One month’s income can be a start, but not a universal standard.

Reserve money is not obliged to earn the maximum return. Its job is to be available and not to vanish during a general crisis.

A reserve looks inefficient until it is needed. That is the usual fate of backup systems.

A person with a stock does sometimes pay less, because he can wait for a discount, buy in bulk and avoid an emergency loan. Poverty, by contrast, often forces you to pay more for small volumes, for interest and for urgency. So thrift is not only a matter of character. It needs capital too.

The urgency premium is constant and visible in small things. Whoever has a reserve buys winter tyres in September, fixes the roof before the rains and replaces the fridge when he has chosen the right one. Whoever has no reserve buys tyres in the first snow at the December price, fixes the roof together with the ceiling, and takes the first available fridge on instalments because the food is spoiling today. The goods are the same; the difference in price is created purely by the inability to wait.

So a reserve does not so much earn as remove a recurring premium. The effect is invisible precisely because it consists of expenses that did not happen, and no household budget has a line for those.