The diagram shows the market for loanable funds.
Which changes could cause the equilibrium to move from ${E_1}$ to ${E_2}$?

1 )
an increase in bank lending and a depletion of natural resources
2 )
an increase in the propensity to save and the discovery of new mineral deposits
advances in technology and a reduction in the propensity to save
4 )
a decline in business confidence and a decrease in bank lending
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