An overview of theoretical and empirical research on how the GFC was transmitted to the real sector, the nature of financial frictions and their impact on the transmission of monetary policy decisions can be found in M. Gertler and S. Gilchrist (2018). What Happened: Financial Factors in the Great Recession, Journal of Economic Perspectives, 32(3).
As a young child, I spent a lot of time being looked after by grandparents in Christchurch. To keep me occupied, my grandmother would set me up at the kitchen table with a jar of coins for the milk collection.