The document discusses using fiscal policy to boost economic growth in OECD countries. It finds that fiscal space, or room for government budget deficits, has increased in most OECD nations since 2014 due to lower interest rates. It recommends countries implement temporary 0.5% of GDP fiscal initiatives for 3-4 years through measures like infrastructure spending and education funding. Such initiatives could boost short-term growth by 0.4-0.6% on average if combined with structural reforms to maximize impact. Collective action across multiple nations could further increase short-term growth gains from fiscal policy.