<p>A bid to give small and mid-sized parties an easier route to party-list seats in the next election has been rejected by the Constitutional Court, which has ruled that original calculation formula is legitimate.</p>

<p>A joint parliament meeting has approved the calculation formula for party-list MPs. Observers see the result as an attempt to forestall landslides by big parties, especially the Pheu Thai Party, but there are questions &nbsp;whether it will be effective.</p>