Ege Erdil says complementary inputs can improve in efficiency alongside one another, citing better materials and aluminum smelting processes that improved toward the end of the 19th century.

“other complementary inputs also becoming more efficient at the same time like you might get better materials like for example uh the like the fact that like aluminum becomes something that's like for example the fact that smelting processes got a lot”

“it got a lot better towards the end of the 19th”

“century so it became a lot easier to work with metal maybe that”