Labour's economic challenge is to grow the country and invest big without alienating global investorsThe government is holding a global investment summit in London on Monday, but business investment in the UK remains the lowest in the G7One of the factors that restrains the government in what they are able to deliver is financeLabour plans to change the borrowing rules so it can spend more on capital projects, whilst raising taxes and curbing spendingThe borrowing rules changes plan will not work if financial markets refuse to buy UK bondsThe budget may be less draconian than expected but a risk remains that it may suck demand out of the economyLabour needs to balance growing the country and investment in public services with the need to keep the global financial markets on boardRapid tax increases and spending curbs will have a more significant impact on the economy than increases in investmentThe City is said to consider going on strike if Rachel Reeves' budget on 30 October goes not receive the approval of global investorsFinance dictates what governments can and can't do, setting the terms of debate and the dominate economic direction