By the ninth century, the Response area empire had emerged in eastern Indochina. It developed around agriculture and used Response area to store water. To the south, the Srivijaya empire emerged in Response area . It relied on farming and trade.

I'm sorry, but I'm not familiar with the term "Response area empire." It seems there might be a mistake or a missing word in your question. If you can provide more context or clarify the term you are referring to, I would be happy to assist you further in understanding the historical developments in eastern Indochina in the ninth century.