Hi, can it be a mistake here " higher as a share"? if not, I don't understand what it means
The only goal of large corporations became maximizing profits and returns for shareholders. Corporate profits are now higher as a share of the total economy, than they were for most of the past century.
It is correct. "as a X" means that we consider something to be X, or we treat/calculate/measure/etc. something as if it was X.
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It is correct. "as a X" means that we consider something to be X, or we treat/calculate/measure/etc. something as if it was X. If profits are measured as a share (fraction) of the total economy, they are higher.