In times past, whenever jobs available on the farm were sparse, Chinese farmers waiting for employment by the farm owner would be gathered at the centre of the village, playing cards and gambling to kill time. A joke spread widely on Chinese social media networks last week suggested similarities between today's stock market investors and those gambling farmers. When our national economy is in its worst shape in more than a decade and many corporates have run into trouble, our stock market suddenly shot up to make everybody happy. What happened to both the Hong Kong and mainland Chinese stock markets last week caught worldwide attention. The bulls can always find reasons to defend why the market was up, but I rarely heard anyone explaining the disconnect between the weak real economy and the so-called bull run. Even the state media probably got over-excited. One Chinese newspaper commentary tried to name the surprising market performance as the latest achievement of President Xi Jinping because the top leadership in the country wanted to "create a new opportunity for wealth redistribution for everyone" to narrow the income gap. Redistribute wealth through the stock market in a socialist country like China? Sounds an exciting new economic theory. To focus on your real job should be the thing you really care about The Shanghai-Hong Kong - and upcoming Shenzhen-Hong Kong - stock through train to give investors in those markets access to each side is widely said to be the main reason the Hang Seng Index got pushed up. Many analysts would explain that mainland Chinese capital was rushing to Hong Kong-listed mainland Chinese companies due to relatively cheaper valuations. That indeed is a valid short-term reason. But what happens next after valuations are no longer cheap? Do investors bother to study basics such as the earnings prospects of those companies? You might agree that as long as you are not the last one holding the stocks and trying to sell, you will be fine. Lan Kwai Fong, our fancy bar area in Central, was full of excited bankers, traders and investors at the weekend. Cheers for my favourite stocks that can make me a new millionaire soon! Long live the booming Hang Seng Index! Does all this sound very familiar? In Hong Kong newspapers last week, we saw fewer articles complaining about skyrocketing property prices as many people suddenly believed the Hang Seng Index could be a quick solution for everyone to afford very expensive apartments. May your dreams come true. But back to the joke about the farmers. To focus on your real job should be the thing you really care about. Get too excited about your "part-time job" in the stock market and we will soon turn China into a gambling nation and contribute to the making of more bubbles. George Chen is the managing editor of SCMP.com International Edition. For more Mr. Shangkong columns: facebook.com/mrshangkong or follow @george_chen on Twitter