The Lower House of the Japanese National Assembly, called the Diet, has a fixed number of 480, while the Upper House of the Diet has 242 seats.
The Upper House was formerly the House of Lords which was abolished after WWII with the noble class gone, too.
The prime minister can dissolve the Lower House at his will at any time, since the Lower House has an advantage to elect the prime minister over the Upper House. The term of the Lower House is four years, though it is dissolved in less than three years on average.
The Upper-House members serve it for six years, but every three years half of them are elected newly.
As Japan has a big financial problem, many critics, journalists, and Media guys discuss that the specified number of seats of both the Houses must be decreased drastically.
However, the ratio of national lawmakers in Japan over the Japanese population is not so large as that in other countries, especially European countries. （This ratio of the US is smaller.）
When cutting costs for democracy, it is important not to reduce the number of representatives of people, but salaries and remuneration of lawmakers should be reduced drastically.
Instead of decreasing the number of the Lower House members, for example, from 480 to 240, rewards for lawmakers should be halved in Japan and any other countries.
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Luk 12:12 For the Holy Ghost shall teach you in the same hour what ye ought to say.