It’s 2 am in a house. Every other person in the house is asleep. The whole street is deserted too. In the spare bedroom, someone is carefully wrapping up a ceramic mug with some bubble wrap. There is also the printing out of an Etsy label and its placement into a pile by the door. The parcel will go out first thing and there is already money in the account. The family doesn’t quite know this is happening.
This scene is not unusual and is framed on the internet in either romantic terms of the plucky entrepreneur building something wonderful in the margins of your life, or in bleak ones of a symptom of wage stagnation and being too skint not to work a second job. Both of these framings are entertaining to read but neither quite explains why the hours involved are so specifically and consistently strange.
The Night Shift the Main Economy Left Behind
What time do you do your side hustle? The answer is a very particular set of times: before 6 am. After 10 pm. On the commute. During the lunch hour. On Sunday afternoons while the television is on in the other room. These hours are the ones that the primary labour market, with its employment contracts and PAYE codes, has already decided it doesn't need.
Your day job is 9 to 5-ish, and your employer has bought those hours and roughly those hours only. The side hustle lives in the space between those hours. That is a large space when you add it all up. Dinner time to midnight on a working weekday is about a third of your waking hours. For most people those hours belong to nobody commercially. Unpriced. And something that is unpriced can be very cheap to use.
The Real Logic Behind "Doing What You Love"
Most people explain why side hustles work economically in terms of passion, flexibility and being your own boss. That is real enough, but underneath it is something more structural. A side hustle lets you sell your time to a second buyer that your first buyer was never going to. So, you're not competing with your job. You're selling something your job didn't want.
The person doing overnight transcription work pitched to American clients is doing exactly this. US business hours land in the UK somewhere between one and nine in the evening, an overlap that British employers have generally already abandoned. So the transcriptionist who stays up until midnight can credibly offer same-day turnaround on work that would take a US-based competitor until tomorrow morning. The odd hours are not a sacrifice: they are the product. The inconvenience is what you're charging for.
The pre-dawn delivery driver knows this intuitively. No one books those shifts because they love being in a van at four in the morning, but the premium is real and there is thin competition for those hours. By 8 am the driver is back home before the day job has even started.
What You're Actually Arbitraging
Arbitrage sounds like something that belongs in a hedge fund, but the principle is ancient and mundane: find something priced low in one market and sell it into another where it's priced higher. In the side hustle economy, the same thing is being done with time – hours that have no buyer in the standard labour market are being sold into specialist markets, such as platforms, client niches, creative communities, where those hours have a price after all.
The Etsy seller wrapping mugs at two in the morning is arbitraging three things at once: her craft skills, undervalued in the salaried market; her tools, already bought for personal use; and her time, the portion nobody else bid on. So the unit economics of the mug only work because the labour cost is, in a real sense, discounted hours.
None of this means side hustles are easy. Sleep deprivation is no fun, and these side hustles are also a commentary on what full-time work is failing to pay. It's all of those things simultaneously. "Finding the time" for a second income, to many, means noticing that large portions of their waking life were already going spare – sitting there in the quiet, unclaimed, waiting for someone to put them to work.
FAQ
Why do side hustles happen at such odd hours?
All of us who have got a day job have got hours that our employer hasn’t bought, and side hustles use them. With a day job covering roughly 9 to 5, for most people those hours are early morning, late evening, commute time, lunchtime and Sunday afternoons. All of those hours are cheap to use for a second income as there’s no commercial buyer in the main labour market for them.
How can working unsociable hours be an advantage?
The odd hours can themselves be the product. A UK transcriptionist working late at night can offer same-day turnaround to American clients as they are working during the UK evening. Early morning delivery drivers face thin competition in the market place as the shifts are so inconvenient for most people, and that inconvenience is what customers are paying for.
What does arbitrage mean in a side hustle?
Arbitrage is buying or finding something in a market where it is cheap and then selling it in another market where it is more expensive. In the case of a side hustle, unwanted hours with no buyer in the standard labour market are sold on specialist markets – such as platforms, client niches or communities of other creatives – where these hours have a real value.
Are side hustles an easy way to earn extra money?
No. Sleep deprivation is a real cost. Side hustles also demonstrate what full-time work does not pay. This Etsy mug seller’s economics depend on her labour being in the form of discounted hours of her waking time. And many people find time for these things because they already had waking hours spare.
