Town Trading Missions (Westbay, Southgate, EastPort):

• Provide 300 Supplies and Receive 1,410 Cash
• Negotiation & Facilitation time: 2 Hours
• Supply to Cash reward ratio --- 1 : 4.7

• Provide 600 Supplies and Receive 2,940 Cash
• Negotiation & Implementation time: 4 Hours
• Supply to Cash reward ratio --- 1 : 4.9

• Provide 900 Supplies and Receive 4,590 Cash
• Implementation & Distribution time: 8 Hours
• Supply to Cash reward ratio --- 1 : 5.1

City Trading Missions (Westford, Metropol C.D., EastShire):

• Provide 1,200 Supplies and Receive 5,400 Cash
• Construction & Development time: 12 Hours
• Supply to Cash reward ratio --- 1 : 4.5

• Provide 2,100 Supplies and Receive 9,660 Cash
• Consultation & Assistance time: 1 Day
• Supply to Cash reward ratio --- 1 : 4.6

• Provide 3000 Supplies and Receive 14,100 Cash
• Distribution & Assistance time: 2 Days
• Supply to Cash reward ratio --- 1 : 4.7

So per basic exchange rate the Towns "Food Distribution" is best if your tight on time and supplies.

But when it comes to drumming up the war-funds as fast as possible you are best doing the shortest time missions.
3 Towns undergoing "Food Distribution" in an 8 hour period nets you 13,770 Cash, using up 2,700 Supplies.
3 Towns undergoing 2 rounds of "Civil Defense Corp" in an 8 hour period nets you 17,640 Cash, using up 3,600 Supplies.
You eat through your supply reserves using 33% more, but get 28% more money.

So per basic exchange rate the Cities "Hearts & Minds" is most efficient (barely) if your supplies are tight.

If you commit 3 Cities to efficiency with "Hearts & Minds", in 2 days you'll make 42,300 Cash, using up 9,000 Supplies.
If you commit 3 Cities to production output running "Build Factories" twice a day for 2 days gets you 64,800 Cash, using up 14,400 Supplies.
You eat through your supply reserves using 26% more, but get 53% more money!

Of course you'll choose your missions to fit your play style and how much supplies you want, but the point is, bigger isn't better. Frequent attention and careful consideration will get you along faster.

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