Cuba's National Assembly has adopted a new constitution that would recognise market economics yet keep the Communist Party firmly in control of the economy and the state.

It will be voted on in a national referendum later this year.

"After it's put to discussion and voted on, Cubans will be more united in their defence of the revolution," said President Miguel Diaz-Canel, wrapping up the two-day session.

The president underscored that "every Cuban can freely express his or her opinions ... on a constitutional text reflecting the present and future of the nation".

Yet those opinions cannot be voiced in a multiparty system. Article 224 reaffirms the socialist character of the Cuban political system, and the "guiding role of the one and only Communist Party".

On the economic front, Cubans are reassured that "property is socialist and belongs to all people, while the economy is state-led".

Ideologically, the constitution does drop a text saying that its goal was achieving a Communist society.

Cash-strapped Cuba has been under a US embargo for more than four decades. Its main economic partner is now Venezuela.

So the government in Havana - short on food, fuel and locally made goods - is keen to get new partners to take a chance on investing in the Caribbean nation of 11 million, even though it staunchly opposes too much concentration of wealth in too few hands domestically.