My understanding is that your income and work contracts are inspected, and that banks can see your other loans / lines of credit.
The rule of thumb is that your loans payment must not be above 1/3 of your income.
To check your income the bank will ask you for a tax document and pay stubs.
People buy house and cars, and the country did not start the sub primes crises in 2008.
Seems to work well enough.