Jim O'Neill, an economist, has expressed concerns about the UK investment plans outlined in Rachel Reeves's inaugural budget as Labour Chancellor. He has pointed out that market skepticism surrounding her spending decisions has led to an increase in the UK's borrowing costs.

O'Neill has emphasized the need for a more convincing approach to boost investment spending and has questioned whether allocating £20 billion for the NHS can result in better productivity compared to previous expenditures. His remarks indicate a broader uncertainty in the market regarding the effectiveness of the proposed financial strategies.