LONDON—Prime Minister Liz Truss looked to reassure the British public and rattled investors that her plan to cut taxes wouldn’t lead to prolonged financial instability, arguing in a series of interviews on Thursday that the country had been buffeted by global shocks rather than her government’s reforms and that her policies would result in faster growth.

Truss told the British Broadcasting Corp.

The new prime minister said she wouldn’t backtrack on plans to carry out big tax cuts and spending increases, a package funded by borrowing which raised alarm among investors.

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