Cunliffe's speech is an attack on the failed neoliberal policies of the last 30 years, and a call for greater co-operation between government and business groups in setting and achieving economic goals. Cunliffe favours a Scandinavian model, rather than the hands-off do-nothing approach of our current government.
Cunliffe used the analogy of the farm or garden throughout his speech.
If you want a garden to grow, then you have to dig the soil and plant the seeds. You have to feed and nurture the plants and you have deal to the weeds when they grow up amongst the crop.This translates to government taking a more active role in managing the economy, as governments do in Scandinavian countries.
In contrast, National's hands-off approach towards the economy involves sitting on the fence and letting the weeds grow up. This means disaster for the nation long term.
There's a lot in the speech (and there was even more in Cunliffe's spoken version), and I don't have time to summarise much further, so read it for yourself.