KUALA LUMPUR: Datuk Seri Najib Tun Razak said he used kangkung (water spinach) to explain the principle of supply and demand because it was a popular vegetable.
"I like to eat kangkung, you all like to eat kangkung. As such, I gave an example which everybody eats. If I use quail as an example, only certain people eat it," he said.
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