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A glance at the current grid provides a contradictory picture. At one extreme is Aston Martin driver Lance Stroll, whose father Lawrence is a billionaire businessman who not only funded his son all the way to F1, but bought him a team in which to race.
World champion Lando Norris graduated through the ranks funded by the millions his father Adam made as a pensions trader, which made him one of the richest men in Britain.
But two-time world champion Fernando Alonso comes from a humble background. His father was an explosives engineer for a mining company in a little-known part of northern Spain, his mother worked in a department store.
Likewise seven-time champion Lewis Hamilton, whose father Anthony famously worked as many as four jobs at a time to fund his son's early career before he was picked up by McLaren aged 11.
Hamilton's team-mate Charles Leclerc's family had run out of money to pursue his career by the time he was 13, before he was picked up by driver manager Nicolas Todt, who helped secure him a place in the Ferrari driver academy.
But Alonso and Hamilton are both over 40. Leclerc is 28. What about people trying to make it now? Do they have to be millionaires?
"Unfortunately, today, I think so, yeah," says Mercedes driver George Russell, who grew up in Norfolk, where his father had a business selling seeds.
"My father spent everything we had on my career. He sold his business, and the total sum he invested was about £1m over 12 years, which is a huge amount of money.
"If I started karting today, I don't think I'd be able to get there. Karting is so expensive. There's kids in karting who are spending the same money as Mercedes spent for me to race in GP3.
"There's a number of drivers on the grid today, top drivers, I don't think they'd be able to get to F1 if they started today."
Even Russell, 28, was an exception. His family funded his career until he made it to GP3 - two steps below F1. Then, aged 16, he was picked up by Mercedes, who fully funded his seasons there and in Formula 2.
What does the F1 ladder cost?
So, what does it cost now to try to make a mark in the categories below F1?
The numbers are eye-opening.
Jos Verstappen - father of four-time F1 champion Max - is still very active in karting, where all racing drivers have to cut their teeth. He says it costs 10-15,000 euros (£9-13,000) a race to buy into a team.
For a full season in the mainstream championships, an eight-year-old would be looking at about £130,000. A 13-year-old £220,000-£260,000.
Move up into cars, and a season of the entry-level Formula 4 category would be £520,000. In Freca - the next level up - that rises to £1m for a season that includes series in Europe and the Middle East.
Formula 3 costs £1.3m-£1.6m. Move up to F2, the final category before F1, and those numbers become £2m-£2.3m.
The cost of climbing the F1 ladder
Use the column header buttons to sort columns by ascending or descending orderCurrently not sorted
But not everyone pays the same. Deals can be struck for the right drivers. In multi-car teams, it's not uncommon for less-talented rich drivers to fund the seats of quicker, less wealthy ones.
Russell - earmarked for the top - says he paid £800,000 for his title-winning F2 season in 2018.
But even so, those numbers are out of reach for all but a tiny proportion of society.
Budgets have increased significantly in real terms in the past 30 years.
Back in 1994, a season of British Formula 3 - which then was the leading international championship - cost about £250,000 in a top team. The equivalent in Formula 3000 - what has now become F2 - was £500,000.
Adjust those numbers for inflation, and they are the equivalent of £500,000 and £1.1m today. So why have costs effectively increased threefold?
The answer to that is rooted in how the championships have developed. Within 10 years, the cost of an F3 season had almost doubled to £500,000. That's the equivalent of about £1.1m now.
In 2005, F3000 became GP2 and was taken over by then Renault F1 team boss Flavio Briatore and his business partner Bruno Michel.
F3 and F3000 had competition between chassis and engine companies. GP2 and GP3, and their successors F2 and F3, are one-make formulae; everyone has to use the same chassis and engine.
The idea is to ensure equality of equipment, the better to compare drivers. Michel negotiates a supply price with F2 and F3's chassis and engine partners, and says he demands the best offer.
"I'm trying to diminish as much as possible the burden of the cost of the cars on the teams," he says.
But the circumstances of those championships have changed significantly.
British F3 was held entirely in the UK. F3000 was European, and generally held at its own standalone events - quite often at lesser-known tracks - only occasionally joining the bill at a grand prix.
Now, both F3 and F2 are part of the F1 package, and the number of races involved in a season has increased significantly. Every extra race costs money - even if it's on the same weekend at the same track - not least in crash damage.
Racing alongside F1 brings significant benefits in terms of exposure, but also a downside when it comes to cost.
The championships have become international, and while F2/F3 covers freight costs centrally, being on the F1 support bill means personnel have to travel to cities hosting grands prix.
As the cost of F1 has increased, it has a knock-on effect for the junior categories. Flights and hotels are more expensive. And the cost of labour has gone up, because the junior categories are competing for personnel with the likes of Formula E and the World Endurance Championship. So the packages engineers and mechanics are offered have to be more competitive.
On top of that, the cars have been made more similar to those in F1, so are more expensive to produce. And safety standards have also improved significantly, as they have in F1. But that also comes at a cost.
Karun Chandhok - now a Sky F1 commentator - says he paid 1.7m euros for his F2 season in 2008. That's the equivalent of 2.2m euros now.
So, give or take, that means F2 has tracked inflation since then.
Although the prices of equipment and spares go up about 15% each time a new car design is introduced, F2 and F3 CEO Michel says he considers the wider economic environment when decisions are made about upgrading cars and insists: "We used to make a bigger margin at the time of GP2 on the spare parts than we do now."
It's karting where costs have really exploded in recent years, insiders say.

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