Australia Post will be putting up its prices again on October 3rd 2016. This is the twice a year price rise that Australia Post has been doing for many years. One of the prices going up is the cost of a 500g satchel which will be increasing to $7.60. In 2004 the cost of posting a 500g satchel cost $4.40. If you use the Reserve Banks inflation calculator that 500g parcel cost should be $5.90 in 2016. Australia Post will be charging $7.60 29% above the inflation rate since 2004.
Another example a 500g Express Post satchel. In 2004 it cost $6.50, after the price rise in October it will cost $10.85. Again according to the RBA it should cost $8.72 in 2016 if the price rise was kept with inflation. The 500g Express Post satchel is $2.13 more expensive than the inflation adjusted price putting the price rise 25% above the inflation rate since 2004. You can find even more Australia Post price increases here