It indeed works very well during 20th century. Unfortunately comes to 21st century, not only has the year changed, personal finance arena has changed drastically as well.
Gold has been speculated so much that it MAY no longer be the standard of money.
There used to be only 'property' in the city. Now there are satellite towns, suburbs ... agriculture lands and even dust bins ( recycle ) have become valuable estates too. While property remains the right category to invest into whenever economy is booming, but predict the right future seems like tougher than buying lottery.
Government bonds used to be de-Facto action when a country is stable. But in today's world, a country is as smart as a taicon's finance. One day they are the LARGEST, the next day they are GONE.
Stock market used to be the back bone of a country's economy. However, the market of derivatives has become so HUGE that the REAL and PHYSICAL is NO LONGER more real than VIRTUAL
So in 21st century, the element of Stock-Property-Funds-Gold is really questionable. However, one fundamental that doesn't change is that
you will have to identify what to do at what time that is BEST for YOU !
Hope you will find your own very best Economy-Political Quadrant soon !