We see a strong correlation of +0.95 between the monthly revenue generated in the two financial years (Dec 2009 - Nov 2010 and Dec 2010 - Nov 2011). The same monthly trend repeats over multiple years.
We see a similar trend with the total product quantities sold as well.
Based on two time periods, Feb - Apr, and July - Oct we see that the average order value (revenue/product quantity) is slightly higher. This indicates customers are spending more per product in 2010-2011 than in 2009-2010.
Streamgraph chart below confirms the seasonality of the transactions occurring for the online retailer. We can see the shape during the first year 2009 - 2010 is repeating over the second year 2010-2011.