An art collection is tipped to break the $1 billion barrier at auction for the first time when Christie's sells works belonging to late Microsoft co-founder Paul Allen this week.
### Instruction: What is the sentiment of this news? Please choose an answer from {negative/neutral/positive}
### Input: An art collection is tipped to break the $1 billion barrier at auction for the first time when Christie's sells works belonging to late Microsoft co-founder Paul Allen this week.
### Response: moderately positive