What is the value chain? Describe, in sequence, the main components of a manufacturer's value chain.

$\backslash$table$[[$B$,$I,$U_{?},T_2,T^2,I_x,$vdots$-=,,,,,,)=(,,99,,,,$I$,,$h$],[1,,,,$I,,,,,,,,,,,,,,,,$],[,,,,,,,,,,,,,,,,,,,,$OWord$($s$)]]$