D1

D2

Dn

Supply

S1

x11

x12

x1n

a1

c11

c12

c1n

S2

x21

x22

x2n

a2

c21

c22

c2n

Sm

xm1

xm2

xmn

am

cm1

cm2

cmn

Demand

b1

b2

bn