Old cars.

Large amounts of debt.

Gambling

Transportation services

RVs

Recreational drugs

Horses and related services

This is fun, but I'll end this with the obligatory: There are two main classes, the ownership class and the working class. The lower and middle classes are subsets of the working class.

College. The middle class is too rich for aid but too poor to pay

Bicycles! Lower class uses them as transportation, upper class uses them for recreation.

Lawyers

Any farm animal

Maybe car leases?

• lower income can’t afford to purchase and a lease is a lower payment
• wealthy either want to replace cars more often or use a car leases by a business

If middle income fall into that trap, it’s probably on the way to lower income?

This is less of a specific good and more of a trend, but middle class people are more likely to buy bulk goods. Lower classes often don't have the means to do so (space to store it and money to buy it, or access to places that sell in bulk) and higher classes simply don't need to, or they buy luxury items that wouldn't be sold in bulk.

Similarly, middle class people are less likely to shop at places with high markups, such as convenience stores.

The times when people shop would also see trends, with lower and higher classes doing more shopping midday on a Tuesday and middle class working people with average 9-5 office jobs being unable to do so.

Cocaine

Eh, that's really for everyone.

I live in a decidedly middle class area and people driving golf carts around is super common. Some communities even have their own golf cart paths to the local grocery stores, and those stores have dedicated gold cart parking.

It's very common at least in the US south east.

Rental properties.

Chlorine for water treatment. Cheap and useful where clean water is difficult to come by and where water is stored for long term use. Also very common to buy if you have a pool. But maybe for middle class households it is not as common of an item - except perhaps in areas were pools are common enough in middle-class homes.

Just a guess!

It’s common to see lower class people drive golf carts around their trailer parks or neighborhoods

I thought this was regional. I’ve seen it in Florida but not where I live, not that I’ve ever been to a trailer park

Horse. You well off, Dad's got a bit of land? Then you can have a horse. Nine of yous, living in a caravan with your Mum? Then you can have a horse. Grow up in a semi-detached? No horse for you!

also interesting: what are the differences in the kinds of goods throughout the world?

Disney Plus, Netflix, Hulu, Cable TV, etc.

The lower class usually get up for their hardworking but ill-paid jobs. The one thing they want to do is go home and turn on the TV and just have their one streaming service work when they've been busting ass all day.

The upper class doesn't really care what the price is, they just have every service stream what they want.

The middle class makes just little enough to not warrant paying that much for a shit streaming service so that they can save up for x hobby, so they'll pirate all day.