New Zealand had escaped the "economic carnage" seen in other countries following the global financial crisis, and maintained the social contract around protection of public health and education.
"That contract however, appears to be frayed around the edges" and in need of review.
"The daily reality of the Salvation Army is that we are seeing in this country a social deficit that is growing, kiwis who are struggling to provide the basic necessities for themselves and their families."
Mr Peters said Major Roberts' speech was important because NZ First was "seriously concerned at the concertina-ing of wealth in fewer and fewer hands" and the "social catastrophe" which meant "the character and nature of this country which made us a world leader is being slowly lost".
"We don't intend to let this go on any longer and we need a game changer and circuit breaker and we believe in this conference we'll deliver it tomorrow in some of our economic and social policies."
Mr Peters said tomorrow's speech would also include tax measures aimed at foreign capital.
"Offshore money is either to build exports, new employment, new creativity, or it can be a corporate raid. That's what the National Party doesn't understand, that's what the right wing have never understood but NZ First does.
"So we're going to encourage wise investment that's in our economic and social interests not this wholesale sell out and sell off in NZ."