Priestley is using language of the LabourPartyManifesto to turn it into drama his audience can relate to. It's an allusion to the language of Sir StanleyBaldwin (prime minister during the period the play covers) attack on capitalism.
"there isn't a chance of war (...) impossible" - mr birling
the audience are manipulated to dislike mr birling for his pompousnature. They don't trust him because WW1 begins a few years after the play is set, contradiciting his predictions in the same way he called the titanic "unsinkable" which is dramatic irony.
'looksdown on the Inspector "I don't like your tone"' - mr birling
the stage directions highlight how patronising he is. He feels threatened by the Inspector's authorativepresence, feeling as if his masculinty is undermimed because he isn't used to opposition due to his status.
this shows that he's fixated on his reputation, he tries to appear congenial even though he doesn't mean it. He appears unsympathetic and pseudo claiming he would pay "thousands" despite refusing Eva the initialmoney. It conveys irresponsibility that a bribe can allow sympathy.
"asking for the earth" - mr birling
the hyperbole is the attempt for him to justify his rejection of Eva's payrise but the absurdity of the statement reflects the absurdity of his refusual to pay a decentwage.