Games like Richer than the King
Games like Richer than the King include Supermarket Simulator, Potion Craft: Alchemist Simulator, Probably Stolen - Cyberpunk Shopkeeper Sim, Big Ambitions, and Mall Simulator. We matched them by the tags players give Richer than the King on Steam (Trading, Economy, Resource Management, Management, and Inventory Management): closest matches first, and among equally close ones the better-known games.

Supermarket Simulator
Shared: Economy · Management · Trading

Potion Craft: Alchemist Simulator
Shared: Management · Medieval · Crafting

Probably Stolen - Cyberpunk Shopkeeper Sim
Shared: Trading · Management · Economy

Big Ambitions
Shared: Economy · Management · Capitalism

Mall Simulator
Shared: Economy · Management · Trading

Game Dev Tycoon
Shared: Management · Economy · Simulation

Mad Games Tycoon
Shared: Management · Economy · Resource Management

Shop Titans
Shared: Management · Economy · Trading

TCG Card Shop Simulator
Shared: Economy · Management · Trading

Turmoil
Shared: Management · Resource Management · Turn-Based Strategy

Cities: Skylines
Shared: Management · Economy · Resource Management

Rise of Industry
Shared: Economy · Management · Resource Management

Foundation
Shared: Medieval · Management · Resource Management

Victoria 3
Shared: Economy · Management · Resource Management

Mad Games Tycoon 2
Shared: Economy · Management · Trading

Retro Rewind - Video Store Simulator
Shared: Management · Resource Management · Economy

Tavern Master
Shared: Management · Resource Management · Medieval

Startup Company
Shared: Economy · Management · Simulation

Cookie Clicker
Shared: Economy · Management · Resource Management

Drug Dealer Simulator
Shared: Resource Management · Trading · Management

Kingdoms and Castles
Shared: Resource Management · Management · Economy

Scritchy Scratchy
Shared: Resource Management · Economy · Management

Barn Finders
Shared: Trading · Economy · Management

Megastore Simulator
Shared: Economy · Management · Trading