The FTSE 100 index broke through 10,000 for the first time in January, adding another 900 points by the end of February. However, the index briefly fell below 10,000 after Iran struck Qatar's Ras Laffan complex, which supplies a fifth of the world's liquefied natural gas. The resilience of companies and investors' belief in a soon energy price calm could be explanations for the market's optimism. However, if oil stays above $100 for another month, higher interest rates will be the way to bet.

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