Which monetary policy transmission mechanisms have been effective in the euro zone since 2014?

Monetary policy became highly expansionary in the euro zone from 2014. An expansionary monetary policy can affect the real economy via different transmission mechanisms: The credit channel (acceleration in lending); The risk channel (fall in risk premia and therefore a fall in risky financing costs); The interest payments channel; The asset price and wealth channel; The exchange rate channel. We seek to determine which of these channels have been effective at stimulating the euro-zone economy since 2014. The only effective channels have been: The risk channel; The interest payments channel for governments and companies.