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When there is market failure so that a market produces less than the efficient amount,
System.err
A standard error output stream in Java, used to send error messages and diagnostic output to the console.
File Class
In programming, a representation of file handling constructs that allow for reading from and writing to files.
BufferedReader
A class in Java used to read text from an input stream efficiently by buffering characters.
String
A series of symbols employed to signify text within the realm of computer coding.
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