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Yes, i've tried the fullscreen mode (resolution 2560x1080), the text and tool-tips are readable. 
Haven't given the Log a chance to prove itself worthy because it gets cut off(screenshot). since the text scrolls from bottom to top, the latest information is lost. in simple browser mode the Log is undreadable.
I'm here to help make this a better experience, so gonna give it a try. how to avoid a brutal cutoff like that?  1. move the log to the other right side could solve it. 2. maybe making the log go from top to bottom would be end of it. 3.  alternatively shrinking some of the other elements on the left side could also work: make all the items be in one row, decrease the vertical size of the upgrades. 4. move the items acquired to a new collumn, so that stats, money, donkey meter, capacity, actions, log remain in the first one, while the second column only holds the acquired items. link for referance of the mentioned game, check how leftside has all the goods there (https://store.steampowered.com/app/271240/Offworld_Trading_Company/)
The town stock surplus/dearth is now clearer that you've mentioned it. The stars show which button is better. so the second time i've played it, i've tried to annihilate all stars on all towns. buying till no stars left to make a good buy, selling till no stars left to make it a good sell.  wasnt really even looking at the numbers, just the stars. and that I guess is some overwhelmingly useful UI, which is the surplus/dearth star indication.
Now to talk about if I was using the numbers. what would be useful to see is the money spent to acquire the items, when hovering over hexes on the left hand side. in other words a reminder at what price where the items were bought. for example, at the start of the game you sell all the silk to acquire 60 gold. then buy some food for 1 gold and tools for 7+8+9+10 gold. So the hover over the hex reminder would tell you that you've spent 1 gold on the available 1 food  and 36 on the tools (average 8.5 /item). once the items are all sold this reminder would show 0 because what you have is 0 items and that gives you 0 coin. 0 item = 0 gold would make afor a great logic check.
on another scenario, with the same 7,8,9,10 value tools. let's say we sell one tool for 11. how would the acquired price change? it could be 36-11 = 25 (avg 8,3/tool). Alternatively, the tooltip could say that the average of the tools is still 8.5/item, and the total gold spent on it was 25.5 coins.