If I had to make the welfare decision again tomorrow, I’d sign it again tomorrow. We had a 60 percent reduction in the welfare rolls. We had an enormous percentage of poor people move into the workforce, start middle-class lifestyles, and when we had a brief tech recession of six months in 2001, after I left office, people who had moved from welfare to work were less likely to be laid off than the general working population. So I would do it again.

Of course, my decision faced plenty of criticism. One of my fellow Japanese CEOs went so far as to call the plan “stupid” – notable, in a country where executives do not generally criticize one another in the press. Clearly, I would have to fight an uphill battle for cultural acceptance. But I was not deterred. A seismic shift demands that we adapt to a new landscape, and a seismic economic shift is exactly what Japan has undergone in recent decades, driven by the forces of globalization and digitization. The only way to compete in this interconnected internet age is to speak the language of the market – and that language is English.

The next generation of telescopes will see millions of events per night with computers that sift through huge amounts of data. If we had had access to a computer, we would never have programmed it to look for something so unexpected. How do you pick up the things you don't know exist, the things you can't tell it to look for? My project was to study quasars, and then we accidentally stumble over these things called pulsars. They were totally unexpected, totally unknown – and it's been huge fun.

The strategy we've adopted precludes our following standard diversification dogma. Many pundits would therefore say the strategy must be riskier than that employed by more conventional investors. We disagree. We believe that a policy of portfolio concentration may well decrease risk if it raises, as it should, both the intensity with which an investor thinks about a business and the comfort-level he must feel with its economic characteristics before buying into it.

So any student who wants to get into psychology, right now the students are like lemmings. They say, “Well, it’s popular to study brain science, I’ll do that.” Or, “It’s popular to do neural networks; I see 30,000 people doing it, it must be good.” And my advice is if a lot of people are doing it, don’t waste your time.