Graph 9-6
This graph refers to the market for oil in Spain. 
-According to Graph 9-6, producer surplus in Spain before trade would be:
Definitions:
Computerized System
An electronic system that uses computers and software to manage, control, or perform a task or process.
Manual System
A system where operations, transactions or processes are carried out without the use of automated or electronic systems, typically involving physical documentation and human intervention.
Internal Controls
Processes and procedures implemented by a company to safeguard its assets, ensure financial report accuracy, and promote operational efficiency.
Current Balances
The total amount present in an account at any given time, reflecting all transactions up to that point.
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