For anyone who doesn't know, arbitrage is an overlay in the market where you can back both sides and guarantee a profit.
last night, one of my outs had the Cards TT U3 -190/+155
Another had u3 -145/+115
I needed -140 to make a play on the under
I could have scalped this out but at book A, I can only get a half unit down on TT. So if I had scalped I would have guaranteed myself 0.02 units.
Instead I played u3 -145 for 1.5*
and o3 +155 for 0.5*
The end result was u3 -140 for 1*