It's almost guaranteed we are not leaving a world of low interest rates (vs historical norms of the past 30 or 50 years).
Most of the global economy is loaded up on debt: Japan, China, the US, large parts of Europe. These days it's the exception when a country has a modest debt context, whether at the government level, corporate level, or household level.
Countries that we normally think of as very well off, such as Denmark, Sweden and the Netherlands are among the most indebted people on earth in terms of household debt to income. They can't afford much higher interest rates at all, it would collapse their housing markets and shatter their household finances.
Australia is in the same boat, two years ago nearly 1/2 of all new Australian mortgages were interest only mortgages; over the last 10 years, the average has been about 35% of all new Australian mortgages have been interest only (in a nation where their housing market is 4x the size of the economy; by comparison, the US housing market is 1.5x the size of its economy). As of a year ago, in total around 39% of all outstanding Australian residential loan balances were interest only. [1] For those that recall the US real-estate bubble, that's a terrifying figure; the US interest-only share of the market during the crazy years of the real-estate bubble was single digits (5-8%). Australia is currently taking action to try to counter this, which is rocking their market presently. [2]
The solid gains Canada made in their household wealth figures over the last decade? Almost entirely from their real estate bubble, which has produced a housing market that as a % of GDP is 2/3 larger than that of the US (the Canadian housing market is 2.5x the size of their economy, up from about 1.6x in 2007). They also can't afford significantly higher interest rates.
New Zealand is similar to Australia, their housing market is 4x the size of their economy. The UK's housing market is 3x the size of their economy, or twice the ratio of the US. These countries are all fragile when it comes to higher interest rates on mortgages.
Even the Swiss are in terrible shape, their household debt as a percentage of GDP is 50% higher than the US ratio.
In the US, its households are in reasonably good shape on debt; US household debt to income figures are the best they've been in decades, essentially the lowest the US has on modern record. Its corporations have loaded up on debt over the last ten years, and of course the Federal Government has taken on immense debt over the same span of time. The US Government simply can't afford 4-5% interest rates on its soon to be $30 trillion in public debt; which is another way of saying: in the US we are never returning to normal interest rates, not under any circumstances. The Fed will go into perpetual QE mode, as Japan has, to guarantee that.
Germany is a particular stand-out among high income nations when it comes to having low government debt, no real estate bubble, and no serious household debt to income ratio problem.
[1] https://i.imgur.com/2Z0mzou.png
[2] https://www.bloomberg.com/news/articles/2018-04-15/tougher-l...