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Roughly about 44% of the UK's exports go to the EU, give or take a couple of percentage points. All 28 EU member states have access to the "single market". This means there are no tariffs, quotas or taxes on trade and the free movement of goods, services, capital and people. If the UK voted to leave the EU, it would have to negotiate a new trade deal with it. It could become part of the European Economic Area (EEA), a deal between Norway, Iceland, Liechtenstein and the European Union. These countries are not full members of the EU but have accepted EU regulations and its so-called four freedoms - the free movement of goods, services, people and capital (although the EU and Liechtenstein agreed an immigration quota so incomers did not affect the national identity of its tiny population). Or it could take the example of Switzerland, which has its own bi-lateral agreement with the EU because its people rejected membership of the EEA in a referendum. However, Switzerland's agreement also requires the free movement of people but has less access for the services industry, a vital part of the UK's economy. Some have suggested that the UK could take the example of Turkey, which is part of a customs union. That means it faces no tariffs (taxes or duties on imports and exports) or quotas on industrial goods it sends within the European Union but it has to apply the European Union's common external tariff, a set rate of tariffs on goods from outside the EU, on those goods too. However, we've concluded that what a new deal would look like remains one of the biggest questions over a vote to leave the EU. The UK's current tariff-free, unrestricted trade deal with the EU would remain in place for at least the first two years of negotiations. But no non-EU countries have negotiated tariff-free unrestricted trade with the EU without contributing to the EU budget and allowing unlimited EU migration. In terms of the effects of a possible Brexit on the economy, we've checked the report issued by the Institute for Fiscal Studies (IFS) which suggested the UK leaving the European Union could lead to austerity being extended by two years. We concluded that, if - like the IFS - you accept predictions that leaving the EU would cut economic growth, it is hard to imagine that would not hit the public finances. We've also looked into what the ratings agencies have said. Standard and Poor's have said it would probably lower the UK's long-term credit rating. Fitch said it would review the UK's credit rating but did not now anticipate a downgrade in the immediate aftermath. Moody's said a vote to leave could lead to a negative outlook because of greater uncertainty and a weaker economy. We have answered some specific questions about trade and the economy that BBC Radio 4's PM programme listeners asked us below. The question: Margaret asks: "How are trade agreements negotiated and how long might they take? We presumably have little experience in this as it is done through the EU and has been for many years. Might one look south of the equator for their experiences or to BRICS (the grouping of Brazil, Russia, India, China and South Africa) for example?" The answer: Trade agreements can vary considerably in depth and breadth. Some are very comprehensive while others are much lighter, offering less market access. Consequently, the time it takes to negotiate trade deals can vary considerably. For example, the EU first opened trade deal negotiations with the regional group Mercosur (which includes the countries Argentina, Brazil, Paraguay, Uruguay and Venezuela) in 2000 but negotiations are still ongoing. By contrast, negotiations for a free trade agreement between the EU and the Republic of Korea were launched in 2007 and the agreement was signed in 2010. Currently, 52 countries are covered by existing EU trade deals. If the UK left the EU and wanted to retain preferential access to the markets of these countries, it would have to renegotiate trade deals with all of them. Some could take longer than others and it would not be up to the UK only, but also to the other countries which would base their negotiating positions on their own interests. The question: Kath asks: "Would the Transatlantic Trade and Investment Partnership (TTIP) agreements still apply to the UK if we left the EU?" The answer: TTIP is the EU-US agreement and it applies only to the EU countries. If the UK ceased to be an EU member, it would not apply to it. The UK could seek its own trade deal with the US post-Brexit, but that would have nothing to do with TTIP. The question: Paul asks: "What is the current state of the EU's trade relations with major Commonwealth economies?" The answer: The EU has already agreed, or is in the process of negotiating, trade deals with a majority of Commonwealth states. In 2015, 22% of imports to the EU came from Commonwealth countries and over 30% of EU exports went to the Commonwealth. Since the UK became a member of the EU, UK trade with Commonwealth countries has fallen, while trade with EU countries has increased. A 2012 House of Commons Library report states that in 1973, UK trade in goods with the Commonwealth constituted roughly 18% of the UK's total trade in goods. By 2011, this figure stood at roughly 10%. In that year, the Commonwealth accounted for an estimated 10% of all UK goods exports and 12% of all UK services exports. With regards to imports, the Commonwealth accounted for an estimated 7% of all UK goods imports and 10% of all UK services imports. The UK's main trading partners (in terms of goods) within the Commonwealth are Canada, India, South Africa, and Australia, accounting for more than 60% of goods imports and exports from the Commonwealth in 2011. The question: Bernard asks: "Do companies in Germany and France grumble about red tape making them uncompetitive?" The answer: German and French businesses have expressed the need to cut bureaucracy and regulations within the EU. In 2015, governments of both countries were part of a joint call of 19 EU member states to the European Commission to reduce the burdens of EU regulations for businesses. However, there is a general understanding that leaving the EU may do more harm than good to businesses and the economy. Germany, in particular, benefits from the single market as the largest member state both in terms of EU internal and external trade in goods. In 2015, Germany's share of EU exports to other member states was 22%. In France, the figure was 9% compared to UK's 6%. In a recent survey of more than 700 British and German companies by the Bertelsmann Foundation, 83% of participating German businesses said that the UK should remain part of the European Union compared to 76% of British companies that took part in the poll. Close to 30% of German businesses with operations in the UK said that they would decrease their capacities in the UK in case of a Brexit. Keep your questions coming by email (realitycheck@bbc.co.uk) or via Twitter @BBCRealityCheck and we'll answer as many as we can before 23 June. Update 20 December 2016: This report has been amended to include details of Liechtenstein's immigration quota. Read more: The facts behind claims in the EU debate
Lots of you have got in touch with the BBC about what a possible exit from the EU might mean for trade and the economy.

Expectant parents are bombarded with advice about what they should and shouldn't be doing. Pregnant women mustn't eat too much as it may raise the baby's risk of obesity or diabetes, but they mustn't diet as that could have a similar effect. Neither should they exercise for fear of triggering a miscarriage, or get too stressed out because that's bad for the baby too. And if they do get stressed, they can't drink alcohol or go for a spa treatment to relax. You might start to think that staying at home would be the sensible thing to do, only this too is ridden with potential dangers for your unborn child: from ice-cream, to pet shampoo, to hair dye. Even lying down or your back can allegedly cut off your baby's blood supply. When I fell pregnant three years ago, I felt paralysed and somewhat patronised by all the conflicting advice out there. I was also obsessed with the little life that was growing inside me, and desperate for more information about what it was doing in there. Could it taste the curry I was eating; hear the songs I was singing; or sense when I took a swim in the freezing outdoor swimming pool near my home? So I began a quest to investigate the truth behind the old wives' tales, alarming newspaper headlines and government guidelines, and to probe deeper into the inner world of the developing child. So Bumpology was born. Booze and breastfeeding Some of what I discovered while researching the book amused and amazed me: I learned that parents who already have a couple of boys are statistically more likely to go on having boys, though no-one really understands why; that the shape of a woman's bump provides no clues as to the gender of the baby within, but that women with severe morning sickness are slightly more likely to be carrying a girl; and that contrary to the received wisdom, babies actually can focus on objects further than 30cm away (even if they often under- or overshoot). I also learned that much of the research underpinning medical advice on things like alcohol consumption - and even the health benefits of breastfeeding - is far from clear-cut and often aimed at the general population, rather than taking the individual into consideration. In the case of alcohol, there's clear evidence that heavy drinking is harmful -- and even a daily glass of wine may increase the odds of a baby being born underweight, which carries additional risks to its health. However, below this level, there is a massive grey zone where scientists simply don't yet have an answer to whether or not alcohol causes harm. When it comes to breastfeeding, it's quite true that breast milk is best for babies, or at least better than formula milk in terms of protecting them against infections in the short term. But when it comes to the much-touted long-term benefits of breastfeeding, such as protection against obesity, diabetes or allergy, the research is less convincing. Certainly women who can't breastfeed for whatever reason, and who live in countries with a decent standard of health care, shouldn't waste too much time worrying that they are causing long-term damage to their baby's health. 'Overblown' However, what alarmed me the most was the realisation that much of what women are told about the risks of medical interventions during labour - things like induction, epidural anaesthesia and undergoing a c-section - are overblown. At the same time, statistics about the odds of needing medical assistance or on complications like tearing during a vaginal birth are frequently not talked about. I believe that access to this kind of information could have a big influence on women's expectations of labour and on some of the decisions they make when planning for the birth of their child. I also think it could help women to come to terms with things if labour doesn't go according to plan and they need additional help getting their baby out. Having a baby can be one of the greatest joys that life bestows. However, it is also hard work and new parents can do without the unnecessary guilt, anxiety and doubt that misleading pregnancy advice brings. It is also a time of great wonder and through my research I have learned things about my own children that will never cease to amaze me. I believe it's time to push aside the scaremongering and allow parents the freedom to enjoy this precious period of their lives.
Pregnancy is a huge, life-changing period in a woman's life and there is no shortage of advice about what is best for your unborn child. But in this week's Scrubbing Up, Linda Geddes, the author of Bumpology, argues this can sometimes be misleading and scaremongering.

Reece Adamson, 30, was found with fatal neck injuries on Cardington Avenue in Great Barr, Birmingham, at about 21:00 on Sunday, West Midlands Police said. Shaun Bent, 24, of Cardington Avenue, is due to appear at Birmingham Crown Court later. Mr Adamson's family said they were "broken beyond belief" by his death, which took place on Father's Day. Mr Bent was charged with murder on Wednesday night and appeared at Birmingham Magistrates' Court on Thursday. He also faces charges of assaulting another person and possession of a bladed article, as well as grievous bodily harm and possessing a knife relating to a separate incident in March, police added. Det Insp Jim Colclough, of the force's homicide team, said there may have been an incident earlier on Sunday evening on Newbury Road near to Alma Street which "involved the same people". "We'd still like to speak to anyone who noticed anything suspicious or who has any dash-cam footage of a fight," he added. In a statement issued by police, Mr Adamson's family said: "It is with heavy hearts and sheer disbelief that Reece was stolen from us on Father's Day. "He was a doting partner, father to his daughter, loving son and grandson. "We will not forget his infectious laugh and are broken beyond belief." Follow BBC West Midlands on Facebook, Twitter and Instagram. Send your story ideas to: newsonline.westmidlands@bbc.co.uk Related Internet Links HM Courts & Tribunals Service

A man has been charged with the murder of a father-of-one who died in a stabbing.

