The lower part (especially from Further_research) doesn't really read like an encyclopedia. 

 The part with additional vectors in Measuring input–output tables) is confusing; showing it in a table like above would make it clearer. 

 A remarkable single sentence (in Example): "... it might be challenging to actually compute the inverse matrix, given that some input–output tables are in excess of hundreds of sectors." Is this just very outdated (My cheap desktop computer can invert a 10,000x10,000 matrix in less than two minutes) or should that be "many thousands" instead of "hundreds"? 

 (I have read this page to get information and with few prior knowledge, so I can't fix it myself, sorry.)