Area 4

This Area contains the remaining 3 businesses: Outhouse, Livery, and Drake Well.

Area 4 mostly follows the same business unlock pattern as Area 3 where they help themselves at first, then another business, then back to them, and so on, with the exception of Livery, which only boosts its own profits except for the first unlock.

Area 4 is also the first Area where the businesses are the opposite from a previous Area, being the opposite of Area 1.

The middle of this Area is slow, but the beginning is medium speed. After the middle, progress becomes really fast, but then it slows down after that if you don't reach Area 5 before reaching bd pioneers. (It slows down to around the same speed as the middle of the Area. It doesn't get worse and worse unlike Area 3.) If you reach be/bf pioneers, some businesses will have 1000 level gaps between their unlocks. Once that happens, do not hire pioneer outlaws for those businesses except to fire the more expensive one after buying the extra levels, if necessary. This strategy will make progress faster than the middle of the Area.

This article contains a complete list of all business upgrade bonuses as well as milestones for upgrading all businesses of a town to a certain level.

This list is up-to-date for the current version of the game (v1.13.4) and was written by Ampelphase.

Area 4 is mostly a copy of area 3, but with more all profit pioneer upgrades and bigger multipliers for ones that are in area 3 as well, and the 3rd business never boosting the profit of other businesses except on the first unlock, which gives x8 profit to the previous business like for all first unlocks in area 4. The beginning cash upgrades are very similar, with lower all profit multipliers than area 3. After around the ba cash range, the upgrade costs no longer match up, but a pattern can still be found until $1 cw, at which point upgrades past that do not exist in area 3, which, when combined with area 4 having all business unlocks boost all profits after 4999, causes area 4 to still be balanced after 1 ba pioneers, unlike area 3.

All-around bonus
This video shows the complete list of all cash upgrades and all pioneer upgrades that can possibly be shown.

Videos for each town