A neat summary of global monetary policy supports deployed during the COVID19 pandemic via McKinsey & Co:
In effect, globally, monetary authorities are underwriting government and private corporate debt for larger companies. This, naturally, will lead to reduced investment and competition from smaller firms, including more innovative ones, raising the relative cost of debt to these companies. Both, directly and indirectly, the monetary policies favour equity investment in top-tier, larger companies, effectively increasing not only the cost of debt, but the cost of capital in the medium term for smaller and medium-sized companies.