The most common form of unsterilized foreign exchange intervention is when a central bank buys or sells foreign exchange reserves. This type of intervention is done when a central bank wants to influence the price of its currency. When a central bank buys more foreign exchange reserves, the price of its currency may increase. Conversely, when a central bank sells more foreign exchange reserves the price of the currency may decrease. Other forms of intervention, such as exchanging one currency for another, can also be conducted.

Unsterilized foreign exchange intervention can have both positive and negative effects on a country's economy. If a central bank uses it to prop up the value of its currency and keep it artificially high, this can lead to economic inefficiencies and slow economic growth. Alternatively, a central bank could use it to strengthen its currency, which would make the country less competitive in international markets and bring down the rate of economic growth.

On the other hand, unsterilized exchange intervention can be beneficial if a central bank uses it to maintain a country's desired exchange rate and manage macroeconomic conditions. It can also help correct imbalances in financial markets, such as an overvalued exchange rate. Additionally, it can be used to promote trade by making certain currencies more competitive against others.

The challenge of implementing unsterilized foreign exchange intervention successfully lies in effectively managing the money supply. Central banks need to continuously monitor the exchange rate movements and the effects of money supply on inflation. If the central bank purchases too much foreign currency and fails to sterilize its effects, it can lead to the overvaluation of a currency, causing the country to struggle in international markets. Conversely, if a central bank sells too much foreign currency, the money supply can decrease and lead to deflation.

Unsterilized foreign exchange intervention can be a useful tool for central banks to manage exchange rates and economic conditions. However, it is important that central banks are cautious in their use of this tool and are aware of the potential consequences of their actions. It is also wise to monitor exchange rates and the money supply on a regular basis to ensure the intervention has the desired effects.