Transparency: Allows all parties to check and validate transactions. This incentivises business to operate honestly. In a taxation system this would allow members of the public to see where their tax money was actually spent, stopping corruption.
Security: In blockchain there is no central authority, there is no one place that can be attacked and no one person to be trusted. The information can not be changed as a result of the mathematics and cryptography used to build the blockchain.
Improved traceability: As each transaction is recorded we can use this information to verify the authenticity of goods and assets. i.e. to see if a diamond came from a slave driven mine. This is also useful in distribution companies for things like, proof of delivery, improving supply chain issues and again proving authenticity of products.
Increased efficiency and speed: As a payment system blockchain would increase efficiency and speed. Making a global transaction can often involve several intermediaries this is a slow and often costly exercise, blockchain removes the need for the middle parties making transactions much smoother.
Reduced cost: Blockchain can reduce cost by using all of the features listed above.
If all transactions are transparent legal disputes may never occur avoiding the costs associated. I.e… Supplier makes a delivery and this is recorded on the blockchain. The company that receive the goods then lose them in a vast warehouse and try to blame their supplier for not delivering them. Using current systems, the supplier may have lost their delivery note and had to take liability as they had no proof of delivery. If the delivery was recorded on blockchain, there would be no dispute so the supplier would not be at a loss.
We typically trust banks and payment services like PayPal to ensure our payments are safe and secure. There is a cost associated with using third parties to secure transactions between A and B. For example, a payment from the UK to Brazil may need to go through several banks in order for it to be fulfilled this often has a large cost associated with it. Using blockchain to fulfil the same payment can be quicker and a lot cheaper as we remove the middle man.
Traceability allows for improved supply chain on a global level. For example, it could be used to verify the authenticity of an alcohol, medicine or tobacco product using a unique barcode. This would help to tackle and prevent the illegal trade of such items and the effect it has on the economy.
The efficiency and speed of blockchain networks will allow for faster and cheaper payments. As they are accessible easily via the internet this will allow more people around the world to have a global financial and personal identity, helping people in corrupt or unstable countries to take ownership of property and to store their assets safely.