added economics qa text

components/layout/Economics/ChainBreakdown.tsx

@@ -1600,7 +1600,23 @@ export default function ChainBreakdown({
             <QuestionAnswer
               className="rounded-3xl bg-forest-50 dark:bg-forest-900 px-[46px] py-[23px] flex flex-col"
               question="More about this page"
-              answer={<>Our Economics section is focused on ......</>}
+              answer={
+                <>
+                  Our Onchain Economics page breaks down how profitable L2s
+                  operate. Profit is the difference between cost and revenue.
+                  Onchain costs can be divided into two parts: L1-cost and
+                  Blob-cost. For L1-cost, we consider the sum of fees each L2
+                  pays for settling on L1, using Ethereum calldata as data
+                  availability or type-3 blob-carrying transactions. Blob-cost
+                  refers to beacon chain blob fees or fees by alternative data
+                  availability services such as Celestia. It is important to
+                  note that we only consider onchain trackable costs; server
+                  fees or other overhead are not considered. Revenue is
+                  calculated from all fees paid by users on the L2.
+                  Additionally, the blob data in MBs is tracked, representing
+                  the total size of all blobs posted per L2.
+                </>
+              }
             />
           </Container>
         </div>