From my experience, large farms should serve city with population of 2+ million, so all under that number should be medium farms. One more indicator is when you go to the Products info, and select Livestock products, you can see how large is actually market for each product for specific City, or for all cities in general. This translates to -> maybe market for eggs is 1mil$ and market for Lamb is 4mil$, which means you need more production units for lamb, where eggs could be serviced by one production unit on one farm.
For stores, general store,discount megastore, and department store don't generate additional sales via "increase in demand", that is provided by other specialized stores. Livestock product can be sold in Discount mega, Supermarket and Corner shop stores, however Discount will sell more for lower price, but Supermarket and Corner shop will sell less, with higher price. When I played I used to think that I need several supermarkets to sell my livestock products and be able to cover whole city area, until I realized that the perfect ratio is to setup one supermarket, drive traffic to it by building apartment building right next to it (with rent set to 60%) and setting up layout where one purchasing unit is connected to two sales units, and all of them are selling single product. This can be even more used with multiple stores feat from Subsidiary DLC. There is no perfect solution, that's the beauty of this game, and you need to experiment around a little.
Two more things that you need to be aware about is training and quality. With training on farm, units will start to produce more with higher quality, and livestock products are all about quality (especially that you always have local competitors that are invisible to you, but are maybe selling higher quality for less). This is fixable via two ways:
1) Hire COO that will control price and has expertise in farms of at least 40 -> when you assign him to the farm, all the units will immediately start with level 3, and you will have products of 40 quality, which is pretty good.
2) Create HR department in your HQ and use instant training for farms -> you need to find how much money to use to be able to train farm to lvl 3, but you will have no need for COO and will save money on yearly basis
Training and COO expertise in retail are also applicable to your stores, but this time higher unit level -> higher volume of sales (you can see this as blue line that represents supply, when the unit is lvl 1-3, the line will be a little choppy and the amount of inventory unit can hold is low, against higher lvl of units 5+, where the line is solid and the capacity is much much higher)
So, my advice for you is to try next:
1. Create medium farm, start producing Frozen Chicken with one unit (raising-processing-sales)
2. Open Supermarket store (traffic index of at least 39) with layout like this
S S S
I I I
P P P
I I I
S S S
3. Start by having first purchasing unit set to Frozen Chicken, and see if the utilization goes up to 100%. If it does, fill second purchasing, and then third.
4. Set the training to max
5. See what happens
Few notes: look at the market share while you are selling, if you want to optimize earnings, you shouldn't be covering whole market -> opening new stores to sell excess from the farm my result in far lesser sales than the first one. If both farm and supermarket are really profitable, the next store may not. Experiment around and inform yourself on COO (if you don't know about it), because no matter what the salary is, he is unburdening you from the wasting time setting up prices, and tinkering with small things, when you can be expanding your empire and setting up research and new companies. Also treat this as a test, not a play session, because your goal is to figure out and learn what is the optimal ratio of farms-stores, producing-selling units and product market. Save game before opening first farm so you can always go back and experiment with the same settings.
I'm here for further questions and discussions
