The economic parallel fold is obtained by folding one page of a document in half. Then postpone folding a second time again in the same direction as the last folding. We will obtain a support of 4 parts then a support of 8 pages. This type of "economic" parallel fold is called because with this system with a single document we obtain a support of 8 pages without the need for staple or cut so it affects prices.
"To live is the art of bowing to necessity." (Remy de Gourmont)