23 A teh purchase of bonds in open market . its so because when there r bonds isuued in the open market ppl will but it and this will reduce the liquidity or liquidity preference cuz ppl will want less money in hand n money invested in bonds
26 B the introduction of more capital-intensive methods of production by mineral producers. its so cuz as and when the industry turns capital intensive it will have price variation as sometimes the productivity increases
30 B profit tax !! here u could use the elimination method to determine the answer income tax sate pension n unemployment benefits r a sure shot yes to automatic stabilisers ! so its only the profit tax which is unlikely so u select it
hope this helps !!
