Which would YOU choose?

Lock in your answer before you see a single number. No take-backs!

✓

💵

Option A

$1,000,000

Cash, right now, today

✓

🪙

Option B

1 Penny

Doubled every day for 30 days

💡 Fair warning: over 90% of people get this wrong on their first try. Trust your gut!

Just getting started… Day 0/30

💵 Option A — $1M

$1,000,000.00

In bank at 5% APY

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🪙 Option B — Penny

$0.01

Doubled each day

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Visual comparison

$1M

Penny

$1M

Penny

Today’s formula: $0.01 × 2⁰ = $0.01

🏆

The Penny Wins!

Here’s the final score after 30 days

$5.37M

Penny — Day 30

$1.004M

$1M Bank — Day 30

Day 28

Penny overtakes

🧮 The formulas

Penny: $0.01 × 2⁽ⁿ⁻¹⁾ Bank: $1,000,000 × (1 + 0.05÷365)ⁿ
One is exponential, the other is barely a straight line by comparison.

🤯 Mind-blowing

Extend to 60 days and the penny is worth over $5.7 quadrillion — more than all money on Earth combined.

🌍 Real-world connections

This same pattern describes how viruses spread, how compound interest grows savings, and why populations double. It’s called exponential growth.