Some people may think it right to invest money on precious metals ,diamond , jade and so on. But I believe that with the development of scientific technology, you will find them become increasingly cheap . For example , in the future people can travel to other planets very easily, it is very possible for them to discover some large gold mines ,then the price of gold will fall sharply. You should pay attention to other fields. You can try to collect some ancient coins or some paintings because their value will be more and more expensive. But you need to grasp a large amount of knowledge about them at first ,or you may be cheated
In my opinion, Australia is famous for its warm wheather which is suitable for the growth of grass of high quality. It bring about lots of food for cows. So today my advice for you is raising cows. Now in the world, more people are seeking for milk powder of high quality although the price is expensive. It is well known all over the world that milk powder made in Australia has a good public praise . That will make people trend to purchase milk power made in Australia when they choose to buy milk powder. So the first benefit of raising cows is your products is competitive. Another benefit is that feces of cows can be made to sewage gas . sewage gas is a clear power and it has many functions. After being made to sewage gas , the dross can be excellent fertilizer for growing organic vegetables and grass. You may see it creates a optimum cycle that is advantageous to the environment. So if you have enough land , raising cows is a better choice.