Hakoniwa Tariff

What happens if you run a global economy with only 30 people, zero-sum resource auctions, and a Uniswap-style Automated Market Maker (AMM) determining exchange rates?

Hakoniwa Tariff is a brutally transparent, minimalist macroeconomic sandbox. There are no scripted events, no central banks, and no invisible hands—just pure math, micro-behaviors, and the chaotic emergent phenomena of international trade.

Built for economics enthusiasts, simulation geeks, and anyone who wants to play God with global markets, this app lets you track every single dollar and resource across decades of simulation.

■ THE LAWS OF THE SANDBOX
This world operates on strict, uncompromising economic axioms:
• Citizens hold ONLY local currency. All international trade instantly clears through the global AMM.
• Exporting does not earn foreign cash—it strictly strengthens your local currency value.
• Foreign reserves are only accumulated when a government actively devalues its currency via "Currency Intervention" on the AMM.
• Seized physical assets from inheritance tax don't disappear; they recycle back into the domestic market, triggering organic wealth redistribution.

■ THE ENGINE: MICRO MEETS MACRO
The World: 3 nations (USA, CHN, JPN). 10 citizens each.
The Micro: Citizens have age, weight, and multi-asset wealth. They bid on 4 resources (Food, Wood, Metal, Oil). If they face starvation (weight drops below 50kg), they abandon all bids except Food. A built-in 2nd-round domestic food auction acts as a safety net, allowing them to buy unsold food at capped prices to survive.
The Macro: Exchange rates are mathematically determined in real-time by a Constant-Product AMM (x * y = k) liquidity pool.
The UBI & Reincarnation Cycle: Citizens pass away at age 10. Financial wealth is taxed to fund Universal Basic Income (UBI), distributed strictly in local currency.

■ PLAY GOD: POLICY LEVERS
Tweak the engine in real-time and watch the 100-year charts—including Gini Index and Holistic Welfare Index (HWI)—react organically:
• Dynamic Tariffs: Weaponize trade by setting import tariffs anywhere from 0% to 1000%.
• Currency Intervention: Forcefully sell local currency into the AMM to acquire foreign reserves and boost export competitiveness.
• UBI & Welfare: Choose between Flat (Universal) payouts or Progressive UBI heavily weighted toward the poorest citizens.
• Export Bans & Protectionism: Unconditionally prioritize domestic buyers in food auctions, or completely lock down resource exports.
• Helicopter Money: Drop arbitrary amounts of cash directly into an economy and watch inflation soar.

■ EMERGENT CRISES & DEFAULT
The system is designed to break naturally. If you implement reckless policies, you won't get a "Game Over" screen. Instead, you will witness a Minsky-style default. When AMM liquidity dries up, nations lose their purchasing power and are physically locked out of global trade. Watch hyper-devaluation and stagflation emerge organically, then try to fix it.

■ SHARE YOUR DYSTOPIA
Hit a fascinating economic collapse? Use the "Save Data Management" feature to export your current world state as a lightweight Base64 text string. Paste this code on Reddit, Hacker News, or Discord to challenge your friends: "Japan's reserves are completely depleted. Here is the code. Guide them back to stability within 50 years."

■ FEATURES
• 100% Offline: No servers required.
• No Ads, No In-App Purchases: Pure, uninterrupted simulation.
• Bulletproof Engine: Run the simulation for 10,000+ years with zero memory leaks.

Take control of the sandbox. Adjust the tariffs. Watch the world react.