Casper Landsten-Thirty Days Later. Casper Landsten once again has $1.05 million (or its Swiss franc equivalent) to invest for three months. He now faces the following rates. Should he enter into a covered interest arbitrage (CIA) investment? The CIA profit potential is %, which tells Casper Landsten he should borrow and invest in the yielding currency, the and then sell the principal and interest forward three months locking in a CIA profit. (Round to three decimal places and select from the drop-down menus.)