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Currency movements affect the real economy through three main channels: import and export prices, corporate earnings, and capital flows. A weaker domestic currency generally helps exporters but raises the cost of imported inputs, so the net effect differs substantially across industries.

Double spending is one of the central problems in digital currency design. Without a central clearing authority, the network must find a way to ensure that the same funds cannot be spent twice, which is achieved through consensus rules, timestamps, and the public broadcast of every valid transaction to all participating nodes.

Crypto wallets fall into two broad categories: custodial and non-custodial. A custodial wallet is operated by a service that holds the private keys on the user's behalf, which is convenient but requires trusting that operator. A non-custodial wallet returns control of the keys to the user, which removes counterparty risk but also means that a lost recovery phrase cannot be restored by anyone.

On-chain transaction fees depend largely on congestion. When many transactions are competing for limited block space, validators prioritize the ones offering higher fees, so the cost of inclusion can rise sharply during busy periods. Batching transfers, using layer-two networks, or simply waiting for quieter hours are common ways to keep costs down.

The logic behind diversification is to reduce the impact of any single asset's volatility on a portfolio. When the correlations between holdings are low, the overall volatility of the combined position is lower than the weighted average of the individual volatilities, an effect known as the diversification benefit.