Brendan
You keep on saying these people are borrowing to invest in the stock market. They are not, this is disposable income that they have.
Let's go back to the beginning. They take out a mortgage to buy a house. It is perfectly reasonable and sensible to do so. Otherwise they are trying to save for their lifetime to accumulate this money to buy the house outright. This debit is paid back over 30 - 35 years, a long time. But at a fairly reasonable rate (at the moment anyway).
They may try to pay down this mortgage earlier than the 30 years but they will still probably be paying it for 2 decades at least. Any overpayments they make into that mortgage is gone and they cannot release equity from it to pay for any future expenditure.
The exception is that it's ok to have a rainy day fund, but not a very big one.
And if you anticipate "big life expenditure" then you should build up a fund to pay for that.
The next stage is building that rainy day fund to pay for holidays and other near term expenditure.
Then there is the big life expenditure that they
"should build up a fund to pay for". Where should this money be put? I want to save for my child's education costs? Do I build up a fund in a deposit account? Or do I invest this amount over the years and use capital markets to pay for some of the cost of the education so the entire cost doesn't come from earned income? This is my entire argument.
As to debt, obviously the more debt a person has, the more exposed they are. Things like Covid 19 can upturn even high paying occupations and turn them to zero overnight. This needs to be looked at and living on debt because you have a good income is not a good thing. It is not building wealth either. Then there are cases when people have very little debt but don't pay it off as they don't want to deplete the investments that they have built up, when they should and start again.
Not all cases are the same and it is important to understand what people are trying to achieve and what matters to them. It's not always straightforward.
Steven
http://www.bluewaterfp.ie (www.bluewaterfp.ie)