instruction:
We would like you to assess the QUALITY of each of the following argument (discussing Death Penalty) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of death penalty. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of death penalty.
question:
What gets little notice, however, is a series of academic studies over the last half-dozen years that claim to settle a once hotly debated argument ��� whether the death penalty acts as a deterrent to murder.
answer:
Valid


question:
If these are indeed comparable, I wouldn't argue for the death penalty even in murder.
answer:
Valid


question:
First it is more expensive to kill a person, then letting him stay for a life long imprisonment.
answer:

Valid