This would in general imply that the central bank should embark on an aggressive policy action in response to expectations instability. And, this will add to the degree of activism displayed by the policy rate.
First, expanding the opportunities of people to trade is almost always welfare enhancing; this applies to financial markets as well as other types of markets. Secondly, access to financial services may help poor people to finance investment in micro-enterprises, for example the purchase of farm inputs, which will enable them to raise their incomes.