It's not even that mate, it's just numbers plucked from thin air, they have to do these silly numbers - otherwise they can't then run stories linking x,y,z with these teams for ridiculous amounts.
Reality is this.
Liverpool - net spend 2.3m (overall spend 69m)
Spurs - net spend 34m (overall spend 70m)
Arsenal net spend 84m (overall spend 96m)
Chelsea net spend 87m (overall spend 122m)
United net spend 143m (overall spend 149m)
City net spend 155m (overall spend 174m)
Everton net spend -2m (overall spend 45m)
Chelsea recouped 65.5m in January in sales
United recouped 41m in sales
Spurs recouped 5m in sales
City spent an additional 27m
Arsenal, Liverpool had no activity
Everton spent an additional 31m
So balancing the figures out for the year to see how much each team actually invested
City - 182m
United - 101m
Arsenal - 84m
Everton - 29m
Spurs - 29m
Chelsea - 21m
Liverpool - minus 2m
In terms of how each club could fund the supposed 'warchests' being bandied about, it can only come via a few ways, the owners bankrolling them, from player sales, or a sudden decision to change the normal strategy of the club and throw a huge amount at the transfer market (which is very rare)
The normal position for each of the clubs listed is this
City - Bankrolled by owners
United and Arsenal - invest part of the huge amount the club generates due to it's massive commercial earnings
Spurs - spend according to their means - normally moderate, this seasons increase was due to the added champions league revenue - otherwise they would have had a zero net spend, big spends from them normally the result of player sales
Liverpool - player sales
Everton - player sales
The Champions league generates about for the winner of the entire thing roughly 45m, about 30m for a semi finalist, last 16 about 18m or so. get into the CL and go out in the group stage - you will earn about 12m or so maximum (figures from last season), those figures can be multiplied up by about 80% for a team from England, Spain or the other Big nations due to revenue distribution for the market pool.
So for Arsenal as a good example as they go out the same point each year - the CL is worth about 35m for them, Spurs this year - it'd be worth about 20m maximum.
The real benefit in the CL is in the commercial deals - which to get them you need to start qualifying regularly and for that to coincide with those commercial deals to be up for renegotiation.
Look at each club now.
City - yeah they could easily go and spend 250m without breaking sweat, without recouping much in sales etc
United - similarly due to the earnings of the club - they could do similar, but looking at them closer, they are unlikely to give a blank cheque and will recoup a lot of what they invest through selling players (they have a big enough squad to be able to do that successfully though), but to think they will be spending 80-100m on multiple players is fantasy land, anything more than one statement signing will be funded by players sales offsetting the incoming costs, and if they don't get CL then they will take a absolutely massive financial hit in some sponsors deals being dramatically reduced which will impact their spending.
Arsenal - a club that will not go above certain levels of spending as the owner simply won't risk that much money, Wenger will stay and is loath to sell players to increase his kitty so to speak, it'll be the exact same situation they always have, some moderate level signings in, a decent net spend - but nothing earth shaking.
Spurs - will repeat the same again, several fringe player sales, several squad player funded by the added CL money and hoping that the young teams natural development will push them over the line, they have a massively costly stadium to fund, they will not be throwing 'monopoly' money at players. The cost of keeping this young team together and all the new contracts will have massively eaten away at their spending power too.
Liverpool, they have owners who have a model and to think that they will go from a net spend negative to throwing 200m in investment at the team is amusing from the media, they are also seriously running out of players to sell to fund their buying as well, last two seasons has seen them go from having a very large squad to it being down to the bare bones, this summer will see the last of the 'expendable' players being offloaded to give Klopp moderate resources to bring in players.
Everton - We are the only team out the lot with a new owner who apparently is trying to push us on a level, as such it's really an unknown what we have and what we will do, he could do a 'mini city' and throw short term a huge amount at us, equally we could end up selling to buy only this summer will show us really.
All the talks about 80m here and 70m there on 3-4 p;layers being bandied about in the media for all those teams is laughable, especially as most of those players linked won't actually solve the glaring weaknesses in the teams as they are just high profile clickbait players
Anyway long, rambling and probably nonsensical post over