My borrowings are now 5X income compared to 15 yrs ago it was 3X income.
Roughly speaking
15yrs ago - income $65k + rental income $5k on $180k borrowings.
Now income $120k + rental income $50k on $1.1m borrowings.
From what i read, because we have hocked ourselves with high debt, it only takes a small increase in interest rates to have a very detrimental effect on the economy compared to say 15-20 yrs ago.