Each Bitcoin is divisible into 100 million satoshis, meaning your 0.1 BTC contains 10 million satoshis (10,000,000 sats). If all other BTC were lost, those 10 million units would need to represent all global economic value.

The global economy is estimated to be ~$100 trillion USD.

With 10 million satoshis in circulation, each satoshi would need to represent $10,000 of value for your BTC to fully support global trade.

Is This Feasible?

1. Price Adjustments: If BTC became the sole monetary unit, purchasing power would adjust. Goods and services would be priced in extremely small fractions of a sat.

2. Further Divisibility: Bitcoin's protocol could theoretically be updated to allow for even smaller fractions of a satoshi.

3. Layer 2 Solutions: Networks like the Lightning Network could introduce off-chain units that facilitate microtransactions, making commerce smoother.